underscore.js

(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define('underscore', factory) :
            (global = typeof globalThis !== 'undefined' ? globalThis : global || self, (function () {
                var current = global._;
                var exports = global._ = factory();
                exports.noConflict = function () { global._ = current; return exports; };
            }()));
}(this, (function () {
    //     Underscore.js 1.13.6
    //     https://underscorejs.org
    //     (c) 2009-2022 Jeremy Ashkenas, Julian Gonggrijp, and DocumentCloud and Investigative Reporters & Editors
    //     Underscore may be freely distributed under the MIT license.

    // Current version.
    var VERSION = '1.13.6';

    // Establish the root object, `window` (`self`) in the browser, `global`
    // on the server, or `this` in some virtual machines. We use `self`
    // instead of `window` for `WebWorker` support.
    var root = (typeof self == 'object' && self.self === self && self) ||
        (typeof global == 'object' && global.global === global && global) ||
        Function('return this')() ||
        {};

    // Save bytes in the minified (but not gzipped) version:
    var ArrayProto = Array.prototype, ObjProto = Object.prototype;
    var SymbolProto = typeof Symbol !== 'undefined' ? Symbol.prototype : null;

    // Create quick reference variables for speed access to core prototypes.
    var push = ArrayProto.push,
        slice = ArrayProto.slice,
        toString = ObjProto.toString,
        hasOwnProperty = ObjProto.hasOwnProperty;

    // Modern feature detection.
    var supportsArrayBuffer = typeof ArrayBuffer !== 'undefined',
        supportsDataView = typeof DataView !== 'undefined';

    // All **ECMAScript 5+** native function implementations that we hope to use
    // are declared here.
    var nativeIsArray = Array.isArray,
        nativeKeys = Object.keys,
        nativeCreate = Object.create,
        nativeIsView = supportsArrayBuffer && ArrayBuffer.isView;

    // Create references to these builtin functions because we override them.
    var _isNaN = isNaN,
        _isFinite = isFinite;

    // Keys in IE < 9 that won't be iterated by `for key in ...` and thus missed.
    var hasEnumBug = !{toString: null}.propertyIsEnumerable('toString');
    var nonEnumerableProps = ['valueOf', 'isPrototypeOf', 'toString',
        'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'];

    // The largest integer that can be represented exactly.
    var MAX_ARRAY_INDEX = Math.pow(2, 53) - 1;

    // Some functions take a variable number of arguments, or a few expected
    // arguments at the beginning and then a variable number of values to operate
    // on. This helper accumulates all remaining arguments past the function’s
    // argument length (or an explicit `startIndex`), into an array that becomes
    // the last argument. Similar to ES6’s "rest parameter".
    function restArguments(func, startIndex) {
        startIndex = startIndex == null ? func.length - 1 : +startIndex;
        return function() {
            var length = Math.max(arguments.length - startIndex, 0),
                rest = Array(length),
                index = 0;
            for (; index < length; index++) {
                rest[index] = arguments[index + startIndex];
            }
            switch (startIndex) {
                case 0: return func.call(this, rest);
                case 1: return func.call(this, arguments[0], rest);
                case 2: return func.call(this, arguments[0], arguments[1], rest);
            }
            var args = Array(startIndex + 1);
            for (index = 0; index < startIndex; index++) {
                args[index] = arguments[index];
            }
            args[startIndex] = rest;
            return func.apply(this, args);
        };
    }

    // Is a given variable an object?
    function isObject(obj) {
        var type = typeof obj;
        return type === 'function' || (type === 'object' && !!obj);
    }

    // Is a given value equal to null?
    function isNull(obj) {
        return obj === null;
    }

    // Is a given variable undefined?
    function isUndefined(obj) {
        return obj === void 0;
    }

    // Is a given value a boolean?
    function isBoolean(obj) {
        return obj === true || obj === false || toString.call(obj) === '[object Boolean]';
    }

    // Is a given value a DOM element?
    function isElement(obj) {
        return !!(obj && obj.nodeType === 1);
    }

    // Internal function for creating a `toString`-based type tester.
    function tagTester(name) {
        var tag = '[object ' + name + ']';
        return function(obj) {
            return toString.call(obj) === tag;
        };
    }

    var isString = tagTester('String');

    var isNumber = tagTester('Number');

    var isDate = tagTester('Date');

    var isRegExp = tagTester('RegExp');

    var isError = tagTester('Error');

    var isSymbol = tagTester('Symbol');

    var isArrayBuffer = tagTester('ArrayBuffer');

    var isFunction = tagTester('Function');

    // Optimize `isFunction` if appropriate. Work around some `typeof` bugs in old
    // v8, IE 11 (#1621), Safari 8 (#1929), and PhantomJS (#2236).
    var nodelist = root.document && root.document.childNodes;
    if (typeof /./ != 'function' && typeof Int8Array != 'object' && typeof nodelist != 'function') {
        isFunction = function(obj) {
            return typeof obj == 'function' || false;
        };
    }

    var isFunction$1 = isFunction;

    var hasObjectTag = tagTester('Object');

    // In IE 10 - Edge 13, `DataView` has string tag `'[object Object]'`.
    // In IE 11, the most common among them, this problem also applies to
    // `Map`, `WeakMap` and `Set`.
    var hasStringTagBug = (
            supportsDataView && hasObjectTag(new DataView(new ArrayBuffer(8)))
        ),
        isIE11 = (typeof Map !== 'undefined' && hasObjectTag(new Map));

    var isDataView = tagTester('DataView');

    // In IE 10 - Edge 13, we need a different heuristic
    // to determine whether an object is a `DataView`.
    function ie10IsDataView(obj) {
        return obj != null && isFunction$1(obj.getInt8) && isArrayBuffer(obj.buffer);
    }

    var isDataView$1 = (hasStringTagBug ? ie10IsDataView : isDataView);

    // Is a given value an array?
    // Delegates to ECMA5's native `Array.isArray`.
    var isArray = nativeIsArray || tagTester('Array');

    // Internal function to check whether `key` is an own property name of `obj`.
    function has$1(obj, key) {
        return obj != null && hasOwnProperty.call(obj, key);
    }

    var isArguments = tagTester('Arguments');

    // Define a fallback version of the method in browsers (ahem, IE < 9), where
    // there isn't any inspectable "Arguments" type.
    (function() {
        if (!isArguments(arguments)) {
            isArguments = function(obj) {
                return has$1(obj, 'callee');
            };
        }
    }());

    var isArguments$1 = isArguments;

    // Is a given object a finite number?
    function isFinite$1(obj) {
        return !isSymbol(obj) && _isFinite(obj) && !isNaN(parseFloat(obj));
    }

    // Is the given value `NaN`?
    function isNaN$1(obj) {
        return isNumber(obj) && _isNaN(obj);
    }

    // Predicate-generating function. Often useful outside of Underscore.
    function constant(value) {
        return function() {
            return value;
        };
    }

    // Common internal logic for `isArrayLike` and `isBufferLike`.
    function createSizePropertyCheck(getSizeProperty) {
        return function(collection) {
            var sizeProperty = getSizeProperty(collection);
            return typeof sizeProperty == 'number' && sizeProperty >= 0 && sizeProperty <= MAX_ARRAY_INDEX;
        }
    }

    // Internal helper to generate a function to obtain property `key` from `obj`.
    function shallowProperty(key) {
        return function(obj) {
            return obj == null ? void 0 : obj[key];
        };
    }

    // Internal helper to obtain the `byteLength` property of an object.
    var getByteLength = shallowProperty('byteLength');

    // Internal helper to determine whether we should spend extensive checks against
    // `ArrayBuffer` et al.
    var isBufferLike = createSizePropertyCheck(getByteLength);

    // Is a given value a typed array?
    var typedArrayPattern = /\[object ((I|Ui)nt(8|16|32)|Float(32|64)|Uint8Clamped|Big(I|Ui)nt64)Array\]/;
    function isTypedArray(obj) {
        // `ArrayBuffer.isView` is the most future-proof, so use it when available.
        // Otherwise, fall back on the above regular expression.
        return nativeIsView ? (nativeIsView(obj) && !isDataView$1(obj)) :
            isBufferLike(obj) && typedArrayPattern.test(toString.call(obj));
    }

    var isTypedArray$1 = supportsArrayBuffer ? isTypedArray : constant(false);

    // Internal helper to obtain the `length` property of an object.
    var getLength = shallowProperty('length');

    // Internal helper to create a simple lookup structure.
    // `collectNonEnumProps` used to depend on `_.contains`, but this led to
    // circular imports. `emulatedSet` is a one-off solution that only works for
    // arrays of strings.
    function emulatedSet(keys) {
        var hash = {};
        for (var l = keys.length, i = 0; i < l; ++i) hash[keys[i]] = true;
        return {
            contains: function(key) { return hash[key] === true; },
            push: function(key) {
                hash[key] = true;
                return keys.push(key);
            }
        };
    }

    // Internal helper. Checks `keys` for the presence of keys in IE < 9 that won't
    // be iterated by `for key in ...` and thus missed. Extends `keys` in place if
    // needed.
    function collectNonEnumProps(obj, keys) {
        keys = emulatedSet(keys);
        var nonEnumIdx = nonEnumerableProps.length;
        var constructor = obj.constructor;
        var proto = (isFunction$1(constructor) && constructor.prototype) || ObjProto;

        // Constructor is a special case.
        var prop = 'constructor';
        if (has$1(obj, prop) && !keys.contains(prop)) keys.push(prop);

        while (nonEnumIdx--) {
            prop = nonEnumerableProps[nonEnumIdx];
            if (prop in obj && obj[prop] !== proto[prop] && !keys.contains(prop)) {
                keys.push(prop);
            }
        }
    }

    // Retrieve the names of an object's own properties.
    // Delegates to **ECMAScript 5**'s native `Object.keys`.
    function keys(obj) {
        if (!isObject(obj)) return [];
        if (nativeKeys) return nativeKeys(obj);
        var keys = [];
        for (var key in obj) if (has$1(obj, key)) keys.push(key);
        // Ahem, IE < 9.
        if (hasEnumBug) collectNonEnumProps(obj, keys);
        return keys;
    }

    // Is a given array, string, or object empty?
    // An "empty" object has no enumerable own-properties.
    function isEmpty(obj) {
        if (obj == null) return true;
        // Skip the more expensive `toString`-based type checks if `obj` has no
        // `.length`.
        var length = getLength(obj);
        if (typeof length == 'number' && (
            isArray(obj) || isString(obj) || isArguments$1(obj)
        )) return length === 0;
        return getLength(keys(obj)) === 0;
    }

    // Returns whether an object has a given set of `key:value` pairs.
    function isMatch(object, attrs) {
        var _keys = keys(attrs), length = _keys.length;
        if (object == null) return !length;
        var obj = Object(object);
        for (var i = 0; i < length; i++) {
            var key = _keys[i];
            if (attrs[key] !== obj[key] || !(key in obj)) return false;
        }
        return true;
    }

    // If Underscore is called as a function, it returns a wrapped object that can
    // be used OO-style. This wrapper holds altered versions of all functions added
    // through `_.mixin`. Wrapped objects may be chained.
    function _$1(obj) {
        if (obj instanceof _$1) return obj;
        if (!(this instanceof _$1)) return new _$1(obj);
        this._wrapped = obj;
    }

    _$1.VERSION = VERSION;

    // Extracts the result from a wrapped and chained object.
    _$1.prototype.value = function() {
        return this._wrapped;
    };

    // Provide unwrapping proxies for some methods used in engine operations
    // such as arithmetic and JSON stringification.
    _$1.prototype.valueOf = _$1.prototype.toJSON = _$1.prototype.value;

    _$1.prototype.toString = function() {
        return String(this._wrapped);
    };

    // Internal function to wrap or shallow-copy an ArrayBuffer,
    // typed array or DataView to a new view, reusing the buffer.
    function toBufferView(bufferSource) {
        return new Uint8Array(
            bufferSource.buffer || bufferSource,
            bufferSource.byteOffset || 0,
            getByteLength(bufferSource)
        );
    }

    // We use this string twice, so give it a name for minification.
    var tagDataView = '[object DataView]';

    // Internal recursive comparison function for `_.isEqual`.
    function eq(a, b, aStack, bStack) {
        // Identical objects are equal. `0 === -0`, but they aren't identical.
        // See the [Harmony `egal` proposal](https://wiki.ecmascript.org/doku.php?id=harmony:egal).
        if (a === b) return a !== 0 || 1 / a === 1 / b;
        // `null` or `undefined` only equal to itself (strict comparison).
        if (a == null || b == null) return false;
        // `NaN`s are equivalent, but non-reflexive.
        if (a !== a) return b !== b;
        // Exhaust primitive checks
        var type = typeof a;
        if (type !== 'function' && type !== 'object' && typeof b != 'object') return false;
        return deepEq(a, b, aStack, bStack);
    }

    // Internal recursive comparison function for `_.isEqual`.
    function deepEq(a, b, aStack, bStack) {
        // Unwrap any wrapped objects.
        if (a instanceof _$1) a = a._wrapped;
        if (b instanceof _$1) b = b._wrapped;
        // Compare `[[Class]]` names.
        var className = toString.call(a);
        if (className !== toString.call(b)) return false;
        // Work around a bug in IE 10 - Edge 13.
        if (hasStringTagBug && className == '[object Object]' && isDataView$1(a)) {
            if (!isDataView$1(b)) return false;
            className = tagDataView;
        }
        switch (className) {
            // These types are compared by value.
            case '[object RegExp]':
            // RegExps are coerced to strings for comparison (Note: '' + /a/i === '/a/i')
            case '[object String]':
                // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
                // equivalent to `new String("5")`.
                return '' + a === '' + b;
            case '[object Number]':
                // `NaN`s are equivalent, but non-reflexive.
                // Object(NaN) is equivalent to NaN.
                if (+a !== +a) return +b !== +b;
                // An `egal` comparison is performed for other numeric values.
                return +a === 0 ? 1 / +a === 1 / b : +a === +b;
            case '[object Date]':
            case '[object Boolean]':
                // Coerce dates and booleans to numeric primitive values. Dates are compared by their
                // millisecond representations. Note that invalid dates with millisecond representations
                // of `NaN` are not equivalent.
                return +a === +b;
            case '[object Symbol]':
                return SymbolProto.valueOf.call(a) === SymbolProto.valueOf.call(b);
            case '[object ArrayBuffer]':
            case tagDataView:
                // Coerce to typed array so we can fall through.
                return deepEq(toBufferView(a), toBufferView(b), aStack, bStack);
        }

        var areArrays = className === '[object Array]';
        if (!areArrays && isTypedArray$1(a)) {
            var byteLength = getByteLength(a);
            if (byteLength !== getByteLength(b)) return false;
            if (a.buffer === b.buffer && a.byteOffset === b.byteOffset) return true;
            areArrays = true;
        }
        if (!areArrays) {
            if (typeof a != 'object' || typeof b != 'object') return false;

            // Objects with different constructors are not equivalent, but `Object`s or `Array`s
            // from different frames are.
            var aCtor = a.constructor, bCtor = b.constructor;
            if (aCtor !== bCtor && !(isFunction$1(aCtor) && aCtor instanceof aCtor &&
                    isFunction$1(bCtor) && bCtor instanceof bCtor)
                && ('constructor' in a && 'constructor' in b)) {
                return false;
            }
        }
        // Assume equality for cyclic structures. The algorithm for detecting cyclic
        // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.

        // Initializing stack of traversed objects.
        // It's done here since we only need them for objects and arrays comparison.
        aStack = aStack || [];
        bStack = bStack || [];
        var length = aStack.length;
        while (length--) {
            // Linear search. Performance is inversely proportional to the number of
            // unique nested structures.
            if (aStack[length] === a) return bStack[length] === b;
        }

        // Add the first object to the stack of traversed objects.
        aStack.push(a);
        bStack.push(b);

        // Recursively compare objects and arrays.
        if (areArrays) {
            // Compare array lengths to determine if a deep comparison is necessary.
            length = a.length;
            if (length !== b.length) return false;
            // Deep compare the contents, ignoring non-numeric properties.
            while (length--) {
                if (!eq(a[length], b[length], aStack, bStack)) return false;
            }
        } else {
            // Deep compare objects.
            var _keys = keys(a), key;
            length = _keys.length;
            // Ensure that both objects contain the same number of properties before comparing deep equality.
            if (keys(b).length !== length) return false;
            while (length--) {
                // Deep compare each member
                key = _keys[length];
                if (!(has$1(b, key) && eq(a[key], b[key], aStack, bStack))) return false;
            }
        }
        // Remove the first object from the stack of traversed objects.
        aStack.pop();
        bStack.pop();
        return true;
    }

    // Perform a deep comparison to check if two objects are equal.
    function isEqual(a, b) {
        return eq(a, b);
    }

    // Retrieve all the enumerable property names of an object.
    function allKeys(obj) {
        if (!isObject(obj)) return [];
        var keys = [];
        for (var key in obj) keys.push(key);
        // Ahem, IE < 9.
        if (hasEnumBug) collectNonEnumProps(obj, keys);
        return keys;
    }

    // Since the regular `Object.prototype.toString` type tests don't work for
    // some types in IE 11, we use a fingerprinting heuristic instead, based
    // on the methods. It's not great, but it's the best we got.
    // The fingerprint method lists are defined below.
    function ie11fingerprint(methods) {
        var length = getLength(methods);
        return function(obj) {
            if (obj == null) return false;
            // `Map`, `WeakMap` and `Set` have no enumerable keys.
            var keys = allKeys(obj);
            if (getLength(keys)) return false;
            for (var i = 0; i < length; i++) {
                if (!isFunction$1(obj[methods[i]])) return false;
            }
            // If we are testing against `WeakMap`, we need to ensure that
            // `obj` doesn't have a `forEach` method in order to distinguish
            // it from a regular `Map`.
            return methods !== weakMapMethods || !isFunction$1(obj[forEachName]);
        };
    }

    // In the interest of compact minification, we write
    // each string in the fingerprints only once.
    var forEachName = 'forEach',
        hasName = 'has',
        commonInit = ['clear', 'delete'],
        mapTail = ['get', hasName, 'set'];

    // `Map`, `WeakMap` and `Set` each have slightly different
    // combinations of the above sublists.
    var mapMethods = commonInit.concat(forEachName, mapTail),
        weakMapMethods = commonInit.concat(mapTail),
        setMethods = ['add'].concat(commonInit, forEachName, hasName);

    var isMap = isIE11 ? ie11fingerprint(mapMethods) : tagTester('Map');

    var isWeakMap = isIE11 ? ie11fingerprint(weakMapMethods) : tagTester('WeakMap');

    var isSet = isIE11 ? ie11fingerprint(setMethods) : tagTester('Set');

    var isWeakSet = tagTester('WeakSet');

    // Retrieve the values of an object's properties.
    function values(obj) {
        var _keys = keys(obj);
        var length = _keys.length;
        var values = Array(length);
        for (var i = 0; i < length; i++) {
            values[i] = obj[_keys[i]];
        }
        return values;
    }

    // Convert an object into a list of `[key, value]` pairs.
    // The opposite of `_.object` with one argument.
    function pairs(obj) {
        var _keys = keys(obj);
        var length = _keys.length;
        var pairs = Array(length);
        for (var i = 0; i < length; i++) {
            pairs[i] = [_keys[i], obj[_keys[i]]];
        }
        return pairs;
    }

    // Invert the keys and values of an object. The values must be serializable.
    function invert(obj) {
        var result = {};
        var _keys = keys(obj);
        for (var i = 0, length = _keys.length; i < length; i++) {
            result[obj[_keys[i]]] = _keys[i];
        }
        return result;
    }

    // Return a sorted list of the function names available on the object.
    function functions(obj) {
        var names = [];
        for (var key in obj) {
            if (isFunction$1(obj[key])) names.push(key);
        }
        return names.sort();
    }

    // An internal function for creating assigner functions.
    function createAssigner(keysFunc, defaults) {
        return function(obj) {
            var length = arguments.length;
            if (defaults) obj = Object(obj);
            if (length < 2 || obj == null) return obj;
            for (var index = 1; index < length; index++) {
                var source = arguments[index],
                    keys = keysFunc(source),
                    l = keys.length;
                for (var i = 0; i < l; i++) {
                    var key = keys[i];
                    if (!defaults || obj[key] === void 0) obj[key] = source[key];
                }
            }
            return obj;
        };
    }

    // Extend a given object with all the properties in passed-in object(s).
    var extend = createAssigner(allKeys);

    // Assigns a given object with all the own properties in the passed-in
    // object(s).
    // (https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
    var extendOwn = createAssigner(keys);

    // Fill in a given object with default properties.
    var defaults = createAssigner(allKeys, true);

    // Create a naked function reference for surrogate-prototype-swapping.
    function ctor() {
        return function(){};
    }

    // An internal function for creating a new object that inherits from another.
    function baseCreate(prototype) {
        if (!isObject(prototype)) return {};
        if (nativeCreate) return nativeCreate(prototype);
        var Ctor = ctor();
        Ctor.prototype = prototype;
        var result = new Ctor;
        Ctor.prototype = null;
        return result;
    }

    // Creates an object that inherits from the given prototype object.
    // If additional properties are provided then they will be added to the
    // created object.
    function create(prototype, props) {
        var result = baseCreate(prototype);
        if (props) extendOwn(result, props);
        return result;
    }

    // Create a (shallow-cloned) duplicate of an object.
    function clone(obj) {
        if (!isObject(obj)) return obj;
        return isArray(obj) ? obj.slice() : extend({}, obj);
    }

    // Invokes `interceptor` with the `obj` and then returns `obj`.
    // The primary purpose of this method is to "tap into" a method chain, in
    // order to perform operations on intermediate results within the chain.
    function tap(obj, interceptor) {
        interceptor(obj);
        return obj;
    }

    // Normalize a (deep) property `path` to array.
    // Like `_.iteratee`, this function can be customized.
    function toPath$1(path) {
        return isArray(path) ? path : [path];
    }
    _$1.toPath = toPath$1;

    // Internal wrapper for `_.toPath` to enable minification.
    // Similar to `cb` for `_.iteratee`.
    function toPath(path) {
        return _$1.toPath(path);
    }

    // Internal function to obtain a nested property in `obj` along `path`.
    function deepGet(obj, path) {
        var length = path.length;
        for (var i = 0; i < length; i++) {
            if (obj == null) return void 0;
            obj = obj[path[i]];
        }
        return length ? obj : void 0;
    }

    // Get the value of the (deep) property on `path` from `object`.
    // If any property in `path` does not exist or if the value is
    // `undefined`, return `defaultValue` instead.
    // The `path` is normalized through `_.toPath`.
    function get(object, path, defaultValue) {
        var value = deepGet(object, toPath(path));
        return isUndefined(value) ? defaultValue : value;
    }

    // Shortcut function for checking if an object has a given property directly on
    // itself (in other words, not on a prototype). Unlike the internal `has`
    // function, this public version can also traverse nested properties.
    function has(obj, path) {
        path = toPath(path);
        var length = path.length;
        for (var i = 0; i < length; i++) {
            var key = path[i];
            if (!has$1(obj, key)) return false;
            obj = obj[key];
        }
        return !!length;
    }

    // Keep the identity function around for default iteratees.
    function identity(value) {
        return value;
    }

    // Returns a predicate for checking whether an object has a given set of
    // `key:value` pairs.
    function matcher(attrs) {
        attrs = extendOwn({}, attrs);
        return function(obj) {
            return isMatch(obj, attrs);
        };
    }

    // Creates a function that, when passed an object, will traverse that object’s
    // properties down the given `path`, specified as an array of keys or indices.
    function property(path) {
        path = toPath(path);
        return function(obj) {
            return deepGet(obj, path);
        };
    }

    // Internal function that returns an efficient (for current engines) version
    // of the passed-in callback, to be repeatedly applied in other Underscore
    // functions.
    function optimizeCb(func, context, argCount) {
        if (context === void 0) return func;
        switch (argCount == null ? 3 : argCount) {
            case 1: return function(value) {
                return func.call(context, value);
            };
            // The 2-argument case is omitted because we’re not using it.
            case 3: return function(value, index, collection) {
                return func.call(context, value, index, collection);
            };
            case 4: return function(accumulator, value, index, collection) {
                return func.call(context, accumulator, value, index, collection);
            };
        }
        return function() {
            return func.apply(context, arguments);
        };
    }

    // An internal function to generate callbacks that can be applied to each
    // element in a collection, returning the desired result — either `_.identity`,
    // an arbitrary callback, a property matcher, or a property accessor.
    function baseIteratee(value, context, argCount) {
        if (value == null) return identity;
        if (isFunction$1(value)) return optimizeCb(value, context, argCount);
        if (isObject(value) && !isArray(value)) return matcher(value);
        return property(value);
    }

    // External wrapper for our callback generator. Users may customize
    // `_.iteratee` if they want additional predicate/iteratee shorthand styles.
    // This abstraction hides the internal-only `argCount` argument.
    function iteratee(value, context) {
        return baseIteratee(value, context, Infinity);
    }
    _$1.iteratee = iteratee;

    // The function we call internally to generate a callback. It invokes
    // `_.iteratee` if overridden, otherwise `baseIteratee`.
    function cb(value, context, argCount) {
        if (_$1.iteratee !== iteratee) return _$1.iteratee(value, context);
        return baseIteratee(value, context, argCount);
    }

    // Returns the results of applying the `iteratee` to each element of `obj`.
    // In contrast to `_.map` it returns an object.
    function mapObject(obj, iteratee, context) {
        iteratee = cb(iteratee, context);
        var _keys = keys(obj),
            length = _keys.length,
            results = {};
        for (var index = 0; index < length; index++) {
            var currentKey = _keys[index];
            results[currentKey] = iteratee(obj[currentKey], currentKey, obj);
        }
        return results;
    }

    // Predicate-generating function. Often useful outside of Underscore.
    function noop(){}

    // Generates a function for a given object that returns a given property.
    function propertyOf(obj) {
        if (obj == null) return noop;
        return function(path) {
            return get(obj, path);
        };
    }

    // Run a function **n** times.
    function times(n, iteratee, context) {
        var accum = Array(Math.max(0, n));
        iteratee = optimizeCb(iteratee, context, 1);
        for (var i = 0; i < n; i++) accum[i] = iteratee(i);
        return accum;
    }

    // Return a random integer between `min` and `max` (inclusive).
    function random(min, max) {
        if (max == null) {
            max = min;
            min = 0;
        }
        return min + Math.floor(Math.random() * (max - min + 1));
    }

    // A (possibly faster) way to get the current timestamp as an integer.
    var now = Date.now || function() {
        return new Date().getTime();
    };

    // Internal helper to generate functions for escaping and unescaping strings
    // to/from HTML interpolation.
    function createEscaper(map) {
        var escaper = function(match) {
            return map[match];
        };
        // Regexes for identifying a key that needs to be escaped.
        var source = '(?:' + keys(map).join('|') + ')';
        var testRegexp = RegExp(source);
        var replaceRegexp = RegExp(source, 'g');
        return function(string) {
            string = string == null ? '' : '' + string;
            return testRegexp.test(string) ? string.replace(replaceRegexp, escaper) : string;
        };
    }

    // Internal list of HTML entities for escaping.
    var escapeMap = {
        '&': '&amp;',
        '<': '&lt;',
        '>': '&gt;',
        '"': '&quot;',
        "'": '&#x27;',
        '`': '&#x60;'
    };

    // Function for escaping strings to HTML interpolation.
    var _escape = createEscaper(escapeMap);

    // Internal list of HTML entities for unescaping.
    var unescapeMap = invert(escapeMap);

    // Function for unescaping strings from HTML interpolation.
    var _unescape = createEscaper(unescapeMap);

    // By default, Underscore uses ERB-style template delimiters. Change the
    // following template settings to use alternative delimiters.
    var templateSettings = _$1.templateSettings = {
        evaluate: /<%([\s\S]+?)%>/g,
        interpolate: /<%=([\s\S]+?)%>/g,
        escape: /<%-([\s\S]+?)%>/g
    };

    // When customizing `_.templateSettings`, if you don't want to define an
    // interpolation, evaluation or escaping regex, we need one that is
    // guaranteed not to match.
    var noMatch = /(.)^/;

    // Certain characters need to be escaped so that they can be put into a
    // string literal.
    var escapes = {
        "'": "'",
        '\\': '\\',
        '\r': 'r',
        '\n': 'n',
        '\u2028': 'u2028',
        '\u2029': 'u2029'
    };

    var escapeRegExp = /\\|'|\r|\n|\u2028|\u2029/g;

    function escapeChar(match) {
        return '\\' + escapes[match];
    }

    // In order to prevent third-party code injection through
    // `_.templateSettings.variable`, we test it against the following regular
    // expression. It is intentionally a bit more liberal than just matching valid
    // identifiers, but still prevents possible loopholes through defaults or
    // destructuring assignment.
    var bareIdentifier = /^\s*(\w|\$)+\s*$/;

    // JavaScript micro-templating, similar to John Resig's implementation.
    // Underscore templating handles arbitrary delimiters, preserves whitespace,
    // and correctly escapes quotes within interpolated code.
    // NB: `oldSettings` only exists for backwards compatibility.
    function template(text, settings, oldSettings) {
        if (!settings && oldSettings) settings = oldSettings;
        settings = defaults({}, settings, _$1.templateSettings);

        // Combine delimiters into one regular expression via alternation.
        var matcher = RegExp([
            (settings.escape || noMatch).source,
            (settings.interpolate || noMatch).source,
            (settings.evaluate || noMatch).source
        ].join('|') + '|$', 'g');

        // Compile the template source, escaping string literals appropriately.
        var index = 0;
        var source = "__p+='";
        text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
            source += text.slice(index, offset).replace(escapeRegExp, escapeChar);
            index = offset + match.length;

            if (escape) {
                source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'";
            } else if (interpolate) {
                source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'";
            } else if (evaluate) {
                source += "';\n" + evaluate + "\n__p+='";
            }

            // Adobe VMs need the match returned to produce the correct offset.
            return match;
        });
        source += "';\n";

        var argument = settings.variable;
        if (argument) {
            // Insure against third-party code injection. (CVE-2021-23358)
            if (!bareIdentifier.test(argument)) throw new Error(
                'variable is not a bare identifier: ' + argument
            );
        } else {
            // If a variable is not specified, place data values in local scope.
            source = 'with(obj||{}){\n' + source + '}\n';
            argument = 'obj';
        }

        source = "var __t,__p='',__j=Array.prototype.join," +
            "print=function(){__p+=__j.call(arguments,'');};\n" +
            source + 'return __p;\n';

        var render;
        try {
            render = new Function(argument, '_', source);
        } catch (e) {
            e.source = source;
            throw e;
        }

        var template = function(data) {
            return render.call(this, data, _$1);
        };

        // Provide the compiled source as a convenience for precompilation.
        template.source = 'function(' + argument + '){\n' + source + '}';

        return template;
    }

    // Traverses the children of `obj` along `path`. If a child is a function, it
    // is invoked with its parent as context. Returns the value of the final
    // child, or `fallback` if any child is undefined.
    function result(obj, path, fallback) {
        path = toPath(path);
        var length = path.length;
        if (!length) {
            return isFunction$1(fallback) ? fallback.call(obj) : fallback;
        }
        for (var i = 0; i < length; i++) {
            var prop = obj == null ? void 0 : obj[path[i]];
            if (prop === void 0) {
                prop = fallback;
                i = length; // Ensure we don't continue iterating.
            }
            obj = isFunction$1(prop) ? prop.call(obj) : prop;
        }
        return obj;
    }

    // Generate a unique integer id (unique within the entire client session).
    // Useful for temporary DOM ids.
    var idCounter = 0;
    function uniqueId(prefix) {
        var id = ++idCounter + '';
        return prefix ? prefix + id : id;
    }

    // Start chaining a wrapped Underscore object.
    function chain(obj) {
        var instance = _$1(obj);
        instance._chain = true;
        return instance;
    }

    // Internal function to execute `sourceFunc` bound to `context` with optional
    // `args`. Determines whether to execute a function as a constructor or as a
    // normal function.
    function executeBound(sourceFunc, boundFunc, context, callingContext, args) {
        if (!(callingContext instanceof boundFunc)) return sourceFunc.apply(context, args);
        var self = baseCreate(sourceFunc.prototype);
        var result = sourceFunc.apply(self, args);
        if (isObject(result)) return result;
        return self;
    }

    // Partially apply a function by creating a version that has had some of its
    // arguments pre-filled, without changing its dynamic `this` context. `_` acts
    // as a placeholder by default, allowing any combination of arguments to be
    // pre-filled. Set `_.partial.placeholder` for a custom placeholder argument.
    var partial = restArguments(function(func, boundArgs) {
        var placeholder = partial.placeholder;
        var bound = function() {
            var position = 0, length = boundArgs.length;
            var args = Array(length);
            for (var i = 0; i < length; i++) {
                args[i] = boundArgs[i] === placeholder ? arguments[position++] : boundArgs[i];
            }
            while (position < arguments.length) args.push(arguments[position++]);
            return executeBound(func, bound, this, this, args);
        };
        return bound;
    });

    partial.placeholder = _$1;

    // Create a function bound to a given object (assigning `this`, and arguments,
    // optionally).
    var bind = restArguments(function(func, context, args) {
        if (!isFunction$1(func)) throw new TypeError('Bind must be called on a function');
        var bound = restArguments(function(callArgs) {
            return executeBound(func, bound, context, this, args.concat(callArgs));
        });
        return bound;
    });

    // Internal helper for collection methods to determine whether a collection
    // should be iterated as an array or as an object.
    // Related: https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength
    // Avoids a very nasty iOS 8 JIT bug on ARM-64. #2094
    var isArrayLike = createSizePropertyCheck(getLength);

    // Internal implementation of a recursive `flatten` function.
    function flatten$1(input, depth, strict, output) {
        output = output || [];
        if (!depth && depth !== 0) {
            depth = Infinity;
        } else if (depth <= 0) {
            return output.concat(input);
        }
        var idx = output.length;
        for (var i = 0, length = getLength(input); i < length; i++) {
            var value = input[i];
            if (isArrayLike(value) && (isArray(value) || isArguments$1(value))) {
                // Flatten current level of array or arguments object.
                if (depth > 1) {
                    flatten$1(value, depth - 1, strict, output);
                    idx = output.length;
                } else {
                    var j = 0, len = value.length;
                    while (j < len) output[idx++] = value[j++];
                }
            } else if (!strict) {
                output[idx++] = value;
            }
        }
        return output;
    }

    // Bind a number of an object's methods to that object. Remaining arguments
    // are the method names to be bound. Useful for ensuring that all callbacks
    // defined on an object belong to it.
    var bindAll = restArguments(function(obj, keys) {
        keys = flatten$1(keys, false, false);
        var index = keys.length;
        if (index < 1) throw new Error('bindAll must be passed function names');
        while (index--) {
            var key = keys[index];
            obj[key] = bind(obj[key], obj);
        }
        return obj;
    });

    // Memoize an expensive function by storing its results.
    function memoize(func, hasher) {
        var memoize = function(key) {
            var cache = memoize.cache;
            var address = '' + (hasher ? hasher.apply(this, arguments) : key);
            if (!has$1(cache, address)) cache[address] = func.apply(this, arguments);
            return cache[address];
        };
        memoize.cache = {};
        return memoize;
    }

    // Delays a function for the given number of milliseconds, and then calls
    // it with the arguments supplied.
    var delay = restArguments(function(func, wait, args) {
        return setTimeout(function() {
            return func.apply(null, args);
        }, wait);
    });

    // Defers a function, scheduling it to run after the current call stack has
    // cleared.
    var defer = partial(delay, _$1, 1);

    // Returns a function, that, when invoked, will only be triggered at most once
    // during a given window of time. Normally, the throttled function will run
    // as much as it can, without ever going more than once per `wait` duration;
    // but if you'd like to disable the execution on the leading edge, pass
    // `{leading: false}`. To disable execution on the trailing edge, ditto.
    function throttle(func, wait, options) {
        var timeout, context, args, result;
        var previous = 0;
        if (!options) options = {};

        var later = function() {
            previous = options.leading === false ? 0 : now();
            timeout = null;
            result = func.apply(context, args);
            if (!timeout) context = args = null;
        };

        var throttled = function() {
            var _now = now();
            if (!previous && options.leading === false) previous = _now;
            var remaining = wait - (_now - previous);
            context = this;
            args = arguments;
            if (remaining <= 0 || remaining > wait) {
                if (timeout) {
                    clearTimeout(timeout);
                    timeout = null;
                }
                previous = _now;
                result = func.apply(context, args);
                if (!timeout) context = args = null;
            } else if (!timeout && options.trailing !== false) {
                timeout = setTimeout(later, remaining);
            }
            return result;
        };

        throttled.cancel = function() {
            clearTimeout(timeout);
            previous = 0;
            timeout = context = args = null;
        };

        return throttled;
    }

    // When a sequence of calls of the returned function ends, the argument
    // function is triggered. The end of a sequence is defined by the `wait`
    // parameter. If `immediate` is passed, the argument function will be
    // triggered at the beginning of the sequence instead of at the end.
    function debounce(func, wait, immediate) {
        var timeout, previous, args, result, context;

        var later = function() {
            var passed = now() - previous;
            if (wait > passed) {
                timeout = setTimeout(later, wait - passed);
            } else {
                timeout = null;
                if (!immediate) result = func.apply(context, args);
                // This check is needed because `func` can recursively invoke `debounced`.
                if (!timeout) args = context = null;
            }
        };

        var debounced = restArguments(function(_args) {
            context = this;
            args = _args;
            previous = now();
            if (!timeout) {
                timeout = setTimeout(later, wait);
                if (immediate) result = func.apply(context, args);
            }
            return result;
        });

        debounced.cancel = function() {
            clearTimeout(timeout);
            timeout = args = context = null;
        };

        return debounced;
    }

    // Returns the first function passed as an argument to the second,
    // allowing you to adjust arguments, run code before and after, and
    // conditionally execute the original function.
    function wrap(func, wrapper) {
        return partial(wrapper, func);
    }

    // Returns a negated version of the passed-in predicate.
    function negate(predicate) {
        return function() {
            return !predicate.apply(this, arguments);
        };
    }

    // Returns a function that is the composition of a list of functions, each
    // consuming the return value of the function that follows.
    function compose() {
        var args = arguments;
        var start = args.length - 1;
        return function() {
            var i = start;
            var result = args[start].apply(this, arguments);
            while (i--) result = args[i].call(this, result);
            return result;
        };
    }

    // Returns a function that will only be executed on and after the Nth call.
    function after(times, func) {
        return function() {
            if (--times < 1) {
                return func.apply(this, arguments);
            }
        };
    }

    // Returns a function that will only be executed up to (but not including) the
    // Nth call.
    function before(times, func) {
        var memo;
        return function() {
            if (--times > 0) {
                memo = func.apply(this, arguments);
            }
            if (times <= 1) func = null;
            return memo;
        };
    }

    // Returns a function that will be executed at most one time, no matter how
    // often you call it. Useful for lazy initialization.
    var once = partial(before, 2);

    // Returns the first key on an object that passes a truth test.
    function findKey(obj, predicate, context) {
        predicate = cb(predicate, context);
        var _keys = keys(obj), key;
        for (var i = 0, length = _keys.length; i < length; i++) {
            key = _keys[i];
            if (predicate(obj[key], key, obj)) return key;
        }
    }

    // Internal function to generate `_.findIndex` and `_.findLastIndex`.
    function createPredicateIndexFinder(dir) {
        return function(array, predicate, context) {
            predicate = cb(predicate, context);
            var length = getLength(array);
            var index = dir > 0 ? 0 : length - 1;
            for (; index >= 0 && index < length; index += dir) {
                if (predicate(array[index], index, array)) return index;
            }
            return -1;
        };
    }

    // Returns the first index on an array-like that passes a truth test.
    var findIndex = createPredicateIndexFinder(1);

    // Returns the last index on an array-like that passes a truth test.
    var findLastIndex = createPredicateIndexFinder(-1);

    // Use a comparator function to figure out the smallest index at which
    // an object should be inserted so as to maintain order. Uses binary search.
    function sortedIndex(array, obj, iteratee, context) {
        iteratee = cb(iteratee, context, 1);
        var value = iteratee(obj);
        var low = 0, high = getLength(array);
        while (low < high) {
            var mid = Math.floor((low + high) / 2);
            if (iteratee(array[mid]) < value) low = mid + 1; else high = mid;
        }
        return low;
    }

    // Internal function to generate the `_.indexOf` and `_.lastIndexOf` functions.
    function createIndexFinder(dir, predicateFind, sortedIndex) {
        return function(array, item, idx) {
            var i = 0, length = getLength(array);
            if (typeof idx == 'number') {
                if (dir > 0) {
                    i = idx >= 0 ? idx : Math.max(idx + length, i);
                } else {
                    length = idx >= 0 ? Math.min(idx + 1, length) : idx + length + 1;
                }
            } else if (sortedIndex && idx && length) {
                idx = sortedIndex(array, item);
                return array[idx] === item ? idx : -1;
            }
            if (item !== item) {
                idx = predicateFind(slice.call(array, i, length), isNaN$1);
                return idx >= 0 ? idx + i : -1;
            }
            for (idx = dir > 0 ? i : length - 1; idx >= 0 && idx < length; idx += dir) {
                if (array[idx] === item) return idx;
            }
            return -1;
        };
    }

    // Return the position of the first occurrence of an item in an array,
    // or -1 if the item is not included in the array.
    // If the array is large and already in sort order, pass `true`
    // for **isSorted** to use binary search.
    var indexOf = createIndexFinder(1, findIndex, sortedIndex);

    // Return the position of the last occurrence of an item in an array,
    // or -1 if the item is not included in the array.
    var lastIndexOf = createIndexFinder(-1, findLastIndex);

    // Return the first value which passes a truth test.
    function find(obj, predicate, context) {
        var keyFinder = isArrayLike(obj) ? findIndex : findKey;
        var key = keyFinder(obj, predicate, context);
        if (key !== void 0 && key !== -1) return obj[key];
    }

    // Convenience version of a common use case of `_.find`: getting the first
    // object containing specific `key:value` pairs.
    function findWhere(obj, attrs) {
        return find(obj, matcher(attrs));
    }

    // The cornerstone for collection functions, an `each`
    // implementation, aka `forEach`.
    // Handles raw objects in addition to array-likes. Treats all
    // sparse array-likes as if they were dense.
    function each(obj, iteratee, context) {
        iteratee = optimizeCb(iteratee, context);
        var i, length;
        if (isArrayLike(obj)) {
            for (i = 0, length = obj.length; i < length; i++) {
                iteratee(obj[i], i, obj);
            }
        } else {
            var _keys = keys(obj);
            for (i = 0, length = _keys.length; i < length; i++) {
                iteratee(obj[_keys[i]], _keys[i], obj);
            }
        }
        return obj;
    }

    // Return the results of applying the iteratee to each element.
    function map(obj, iteratee, context) {
        iteratee = cb(iteratee, context);
        var _keys = !isArrayLike(obj) && keys(obj),
            length = (_keys || obj).length,
            results = Array(length);
        for (var index = 0; index < length; index++) {
            var currentKey = _keys ? _keys[index] : index;
            results[index] = iteratee(obj[currentKey], currentKey, obj);
        }
        return results;
    }

    // Internal helper to create a reducing function, iterating left or right.
    function createReduce(dir) {
        // Wrap code that reassigns argument variables in a separate function than
        // the one that accesses `arguments.length` to avoid a perf hit. (#1991)
        var reducer = function(obj, iteratee, memo, initial) {
            var _keys = !isArrayLike(obj) && keys(obj),
                length = (_keys || obj).length,
                index = dir > 0 ? 0 : length - 1;
            if (!initial) {
                memo = obj[_keys ? _keys[index] : index];
                index += dir;
            }
            for (; index >= 0 && index < length; index += dir) {
                var currentKey = _keys ? _keys[index] : index;
                memo = iteratee(memo, obj[currentKey], currentKey, obj);
            }
            return memo;
        };

        return function(obj, iteratee, memo, context) {
            var initial = arguments.length >= 3;
            return reducer(obj, optimizeCb(iteratee, context, 4), memo, initial);
        };
    }

    // **Reduce** builds up a single result from a list of values, aka `inject`,
    // or `foldl`.
    var reduce = createReduce(1);

    // The right-associative version of reduce, also known as `foldr`.
    var reduceRight = createReduce(-1);

    // Return all the elements that pass a truth test.
    function filter(obj, predicate, context) {
        var results = [];
        predicate = cb(predicate, context);
        each(obj, function(value, index, list) {
            if (predicate(value, index, list)) results.push(value);
        });
        return results;
    }

    // Return all the elements for which a truth test fails.
    function reject(obj, predicate, context) {
        return filter(obj, negate(cb(predicate)), context);
    }

    // Determine whether all of the elements pass a truth test.
    function every(obj, predicate, context) {
        predicate = cb(predicate, context);
        var _keys = !isArrayLike(obj) && keys(obj),
            length = (_keys || obj).length;
        for (var index = 0; index < length; index++) {
            var currentKey = _keys ? _keys[index] : index;
            if (!predicate(obj[currentKey], currentKey, obj)) return false;
        }
        return true;
    }

    // Determine if at least one element in the object passes a truth test.
    function some(obj, predicate, context) {
        predicate = cb(predicate, context);
        var _keys = !isArrayLike(obj) && keys(obj),
            length = (_keys || obj).length;
        for (var index = 0; index < length; index++) {
            var currentKey = _keys ? _keys[index] : index;
            if (predicate(obj[currentKey], currentKey, obj)) return true;
        }
        return false;
    }

    // Determine if the array or object contains a given item (using `===`).
    function contains(obj, item, fromIndex, guard) {
        if (!isArrayLike(obj)) obj = values(obj);
        if (typeof fromIndex != 'number' || guard) fromIndex = 0;
        return indexOf(obj, item, fromIndex) >= 0;
    }

    // Invoke a method (with arguments) on every item in a collection.
    var invoke = restArguments(function(obj, path, args) {
        var contextPath, func;
        if (isFunction$1(path)) {
            func = path;
        } else {
            path = toPath(path);
            contextPath = path.slice(0, -1);
            path = path[path.length - 1];
        }
        return map(obj, function(context) {
            var method = func;
            if (!method) {
                if (contextPath && contextPath.length) {
                    context = deepGet(context, contextPath);
                }
                if (context == null) return void 0;
                method = context[path];
            }
            return method == null ? method : method.apply(context, args);
        });
    });

    // Convenience version of a common use case of `_.map`: fetching a property.
    function pluck(obj, key) {
        return map(obj, property(key));
    }

    // Convenience version of a common use case of `_.filter`: selecting only
    // objects containing specific `key:value` pairs.
    function where(obj, attrs) {
        return filter(obj, matcher(attrs));
    }

    // Return the maximum element (or element-based computation).
    function max(obj, iteratee, context) {
        var result = -Infinity, lastComputed = -Infinity,
            value, computed;
        if (iteratee == null || (typeof iteratee == 'number' && typeof obj[0] != 'object' && obj != null)) {
            obj = isArrayLike(obj) ? obj : values(obj);
            for (var i = 0, length = obj.length; i < length; i++) {
                value = obj[i];
                if (value != null && value > result) {
                    result = value;
                }
            }
        } else {
            iteratee = cb(iteratee, context);
            each(obj, function(v, index, list) {
                computed = iteratee(v, index, list);
                if (computed > lastComputed || (computed === -Infinity && result === -Infinity)) {
                    result = v;
                    lastComputed = computed;
                }
            });
        }
        return result;
    }

    // Return the minimum element (or element-based computation).
    function min(obj, iteratee, context) {
        var result = Infinity, lastComputed = Infinity,
            value, computed;
        if (iteratee == null || (typeof iteratee == 'number' && typeof obj[0] != 'object' && obj != null)) {
            obj = isArrayLike(obj) ? obj : values(obj);
            for (var i = 0, length = obj.length; i < length; i++) {
                value = obj[i];
                if (value != null && value < result) {
                    result = value;
                }
            }
        } else {
            iteratee = cb(iteratee, context);
            each(obj, function(v, index, list) {
                computed = iteratee(v, index, list);
                if (computed < lastComputed || (computed === Infinity && result === Infinity)) {
                    result = v;
                    lastComputed = computed;
                }
            });
        }
        return result;
    }

    // Safely create a real, live array from anything iterable.
    var reStrSymbol = /[^\ud800-\udfff]|[\ud800-\udbff][\udc00-\udfff]|[\ud800-\udfff]/g;
    function toArray(obj) {
        if (!obj) return [];
        if (isArray(obj)) return slice.call(obj);
        if (isString(obj)) {
            // Keep surrogate pair characters together.
            return obj.match(reStrSymbol);
        }
        if (isArrayLike(obj)) return map(obj, identity);
        return values(obj);
    }

    // Sample **n** random values from a collection using the modern version of the
    // [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher–Yates_shuffle).
    // If **n** is not specified, returns a single random element.
    // The internal `guard` argument allows it to work with `_.map`.
    function sample(obj, n, guard) {
        if (n == null || guard) {
            if (!isArrayLike(obj)) obj = values(obj);
            return obj[random(obj.length - 1)];
        }
        var sample = toArray(obj);
        var length = getLength(sample);
        n = Math.max(Math.min(n, length), 0);
        var last = length - 1;
        for (var index = 0; index < n; index++) {
            var rand = random(index, last);
            var temp = sample[index];
            sample[index] = sample[rand];
            sample[rand] = temp;
        }
        return sample.slice(0, n);
    }

    // Shuffle a collection.
    function shuffle(obj) {
        return sample(obj, Infinity);
    }

    // Sort the object's values by a criterion produced by an iteratee.
    function sortBy(obj, iteratee, context) {
        var index = 0;
        iteratee = cb(iteratee, context);
        return pluck(map(obj, function(value, key, list) {
            return {
                value: value,
                index: index++,
                criteria: iteratee(value, key, list)
            };
        }).sort(function(left, right) {
            var a = left.criteria;
            var b = right.criteria;
            if (a !== b) {
                if (a > b || a === void 0) return 1;
                if (a < b || b === void 0) return -1;
            }
            return left.index - right.index;
        }), 'value');
    }

    // An internal function used for aggregate "group by" operations.
    function group(behavior, partition) {
        return function(obj, iteratee, context) {
            var result = partition ? [[], []] : {};
            iteratee = cb(iteratee, context);
            each(obj, function(value, index) {
                var key = iteratee(value, index, obj);
                behavior(result, value, key);
            });
            return result;
        };
    }

    // Groups the object's values by a criterion. Pass either a string attribute
    // to group by, or a function that returns the criterion.
    var groupBy = group(function(result, value, key) {
        if (has$1(result, key)) result[key].push(value); else result[key] = [value];
    });

    // Indexes the object's values by a criterion, similar to `_.groupBy`, but for
    // when you know that your index values will be unique.
    var indexBy = group(function(result, value, key) {
        result[key] = value;
    });

    // Counts instances of an object that group by a certain criterion. Pass
    // either a string attribute to count by, or a function that returns the
    // criterion.
    var countBy = group(function(result, value, key) {
        if (has$1(result, key)) result[key]++; else result[key] = 1;
    });

    // Split a collection into two arrays: one whose elements all pass the given
    // truth test, and one whose elements all do not pass the truth test.
    var partition = group(function(result, value, pass) {
        result[pass ? 0 : 1].push(value);
    }, true);

    // Return the number of elements in a collection.
    function size(obj) {
        if (obj == null) return 0;
        return isArrayLike(obj) ? obj.length : keys(obj).length;
    }

    // Internal `_.pick` helper function to determine whether `key` is an enumerable
    // property name of `obj`.
    function keyInObj(value, key, obj) {
        return key in obj;
    }

    // Return a copy of the object only containing the allowed properties.
    var pick = restArguments(function(obj, keys) {
        var result = {}, iteratee = keys[0];
        if (obj == null) return result;
        if (isFunction$1(iteratee)) {
            if (keys.length > 1) iteratee = optimizeCb(iteratee, keys[1]);
            keys = allKeys(obj);
        } else {
            iteratee = keyInObj;
            keys = flatten$1(keys, false, false);
            obj = Object(obj);
        }
        for (var i = 0, length = keys.length; i < length; i++) {
            var key = keys[i];
            var value = obj[key];
            if (iteratee(value, key, obj)) result[key] = value;
        }
        return result;
    });

    // Return a copy of the object without the disallowed properties.
    var omit = restArguments(function(obj, keys) {
        var iteratee = keys[0], context;
        if (isFunction$1(iteratee)) {
            iteratee = negate(iteratee);
            if (keys.length > 1) context = keys[1];
        } else {
            keys = map(flatten$1(keys, false, false), String);
            iteratee = function(value, key) {
                return !contains(keys, key);
            };
        }
        return pick(obj, iteratee, context);
    });

    // Returns everything but the last entry of the array. Especially useful on
    // the arguments object. Passing **n** will return all the values in
    // the array, excluding the last N.
    function initial(array, n, guard) {
        return slice.call(array, 0, Math.max(0, array.length - (n == null || guard ? 1 : n)));
    }

    // Get the first element of an array. Passing **n** will return the first N
    // values in the array. The **guard** check allows it to work with `_.map`.
    function first(array, n, guard) {
        if (array == null || array.length < 1) return n == null || guard ? void 0 : [];
        if (n == null || guard) return array[0];
        return initial(array, array.length - n);
    }

    // Returns everything but the first entry of the `array`. Especially useful on
    // the `arguments` object. Passing an **n** will return the rest N values in the
    // `array`.
    function rest(array, n, guard) {
        return slice.call(array, n == null || guard ? 1 : n);
    }

    // Get the last element of an array. Passing **n** will return the last N
    // values in the array.
    function last(array, n, guard) {
        if (array == null || array.length < 1) return n == null || guard ? void 0 : [];
        if (n == null || guard) return array[array.length - 1];
        return rest(array, Math.max(0, array.length - n));
    }

    // Trim out all falsy values from an array.
    function compact(array) {
        return filter(array, Boolean);
    }

    // Flatten out an array, either recursively (by default), or up to `depth`.
    // Passing `true` or `false` as `depth` means `1` or `Infinity`, respectively.
    function flatten(array, depth) {
        return flatten$1(array, depth, false);
    }

    // Take the difference between one array and a number of other arrays.
    // Only the elements present in just the first array will remain.
    var difference = restArguments(function(array, rest) {
        rest = flatten$1(rest, true, true);
        return filter(array, function(value){
            return !contains(rest, value);
        });
    });

    // Return a version of the array that does not contain the specified value(s).
    var without = restArguments(function(array, otherArrays) {
        return difference(array, otherArrays);
    });

    // Produce a duplicate-free version of the array. If the array has already
    // been sorted, you have the option of using a faster algorithm.
    // The faster algorithm will not work with an iteratee if the iteratee
    // is not a one-to-one function, so providing an iteratee will disable
    // the faster algorithm.
    function uniq(array, isSorted, iteratee, context) {
        if (!isBoolean(isSorted)) {
            context = iteratee;
            iteratee = isSorted;
            isSorted = false;
        }
        if (iteratee != null) iteratee = cb(iteratee, context);
        var result = [];
        var seen = [];
        for (var i = 0, length = getLength(array); i < length; i++) {
            var value = array[i],
                computed = iteratee ? iteratee(value, i, array) : value;
            if (isSorted && !iteratee) {
                if (!i || seen !== computed) result.push(value);
                seen = computed;
            } else if (iteratee) {
                if (!contains(seen, computed)) {
                    seen.push(computed);
                    result.push(value);
                }
            } else if (!contains(result, value)) {
                result.push(value);
            }
        }
        return result;
    }

    // Produce an array that contains the union: each distinct element from all of
    // the passed-in arrays.
    var union = restArguments(function(arrays) {
        return uniq(flatten$1(arrays, true, true));
    });

    // Produce an array that contains every item shared between all the
    // passed-in arrays.
    function intersection(array) {
        var result = [];
        var argsLength = arguments.length;
        for (var i = 0, length = getLength(array); i < length; i++) {
            var item = array[i];
            if (contains(result, item)) continue;
            var j;
            for (j = 1; j < argsLength; j++) {
                if (!contains(arguments[j], item)) break;
            }
            if (j === argsLength) result.push(item);
        }
        return result;
    }

    // Complement of zip. Unzip accepts an array of arrays and groups
    // each array's elements on shared indices.
    function unzip(array) {
        var length = (array && max(array, getLength).length) || 0;
        var result = Array(length);

        for (var index = 0; index < length; index++) {
            result[index] = pluck(array, index);
        }
        return result;
    }

    // Zip together multiple lists into a single array -- elements that share
    // an index go together.
    var zip = restArguments(unzip);

    // Converts lists into objects. Pass either a single array of `[key, value]`
    // pairs, or two parallel arrays of the same length -- one of keys, and one of
    // the corresponding values. Passing by pairs is the reverse of `_.pairs`.
    function object(list, values) {
        var result = {};
        for (var i = 0, length = getLength(list); i < length; i++) {
            if (values) {
                result[list[i]] = values[i];
            } else {
                result[list[i][0]] = list[i][1];
            }
        }
        return result;
    }

    // Generate an integer Array containing an arithmetic progression. A port of
    // the native Python `range()` function. See
    // [the Python documentation](https://docs.python.org/library/functions.html#range).
    function range(start, stop, step) {
        if (stop == null) {
            stop = start || 0;
            start = 0;
        }
        if (!step) {
            step = stop < start ? -1 : 1;
        }

        var length = Math.max(Math.ceil((stop - start) / step), 0);
        var range = Array(length);

        for (var idx = 0; idx < length; idx++, start += step) {
            range[idx] = start;
        }

        return range;
    }

    // Chunk a single array into multiple arrays, each containing `count` or fewer
    // items.
    function chunk(array, count) {
        if (count == null || count < 1) return [];
        var result = [];
        var i = 0, length = array.length;
        while (i < length) {
            result.push(slice.call(array, i, i += count));
        }
        return result;
    }

    // Helper function to continue chaining intermediate results.
    function chainResult(instance, obj) {
        return instance._chain ? _$1(obj).chain() : obj;
    }

    // Add your own custom functions to the Underscore object.
    function mixin(obj) {
        each(functions(obj), function(name) {
            var func = _$1[name] = obj[name];
            _$1.prototype[name] = function() {
                var args = [this._wrapped];
                push.apply(args, arguments);
                return chainResult(this, func.apply(_$1, args));
            };
        });
        return _$1;
    }

    // Add all mutator `Array` functions to the wrapper.
    each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
        var method = ArrayProto[name];
        _$1.prototype[name] = function() {
            var obj = this._wrapped;
            if (obj != null) {
                method.apply(obj, arguments);
                if ((name === 'shift' || name === 'splice') && obj.length === 0) {
                    delete obj[0];
                }
            }
            return chainResult(this, obj);
        };
    });

    // Add all accessor `Array` functions to the wrapper.
    each(['concat', 'join', 'slice'], function(name) {
        var method = ArrayProto[name];
        _$1.prototype[name] = function() {
            var obj = this._wrapped;
            if (obj != null) obj = method.apply(obj, arguments);
            return chainResult(this, obj);
        };
    });

    // Named Exports

    var allExports = {
        __proto__: null,
        VERSION: VERSION,
        restArguments: restArguments,
        isObject: isObject,
        isNull: isNull,
        isUndefined: isUndefined,
        isBoolean: isBoolean,
        isElement: isElement,
        isString: isString,
        isNumber: isNumber,
        isDate: isDate,
        isRegExp: isRegExp,
        isError: isError,
        isSymbol: isSymbol,
        isArrayBuffer: isArrayBuffer,
        isDataView: isDataView$1,
        isArray: isArray,
        isFunction: isFunction$1,
        isArguments: isArguments$1,
        isFinite: isFinite$1,
        isNaN: isNaN$1,
        isTypedArray: isTypedArray$1,
        isEmpty: isEmpty,
        isMatch: isMatch,
        isEqual: isEqual,
        isMap: isMap,
        isWeakMap: isWeakMap,
        isSet: isSet,
        isWeakSet: isWeakSet,
        keys: keys,
        allKeys: allKeys,
        values: values,
        pairs: pairs,
        invert: invert,
        functions: functions,
        methods: functions,
        extend: extend,
        extendOwn: extendOwn,
        assign: extendOwn,
        defaults: defaults,
        create: create,
        clone: clone,
        tap: tap,
        get: get,
        has: has,
        mapObject: mapObject,
        identity: identity,
        constant: constant,
        noop: noop,
        toPath: toPath$1,
        property: property,
        propertyOf: propertyOf,
        matcher: matcher,
        matches: matcher,
        times: times,
        random: random,
        now: now,
        escape: _escape,
        unescape: _unescape,
        templateSettings: templateSettings,
        template: template,
        result: result,
        uniqueId: uniqueId,
        chain: chain,
        iteratee: iteratee,
        partial: partial,
        bind: bind,
        bindAll: bindAll,
        memoize: memoize,
        delay: delay,
        defer: defer,
        throttle: throttle,
        debounce: debounce,
        wrap: wrap,
        negate: negate,
        compose: compose,
        after: after,
        before: before,
        once: once,
        findKey: findKey,
        findIndex: findIndex,
        findLastIndex: findLastIndex,
        sortedIndex: sortedIndex,
        indexOf: indexOf,
        lastIndexOf: lastIndexOf,
        find: find,
        detect: find,
        findWhere: findWhere,
        each: each,
        forEach: each,
        map: map,
        collect: map,
        reduce: reduce,
        foldl: reduce,
        inject: reduce,
        reduceRight: reduceRight,
        foldr: reduceRight,
        filter: filter,
        select: filter,
        reject: reject,
        every: every,
        all: every,
        some: some,
        any: some,
        contains: contains,
        includes: contains,
        include: contains,
        invoke: invoke,
        pluck: pluck,
        where: where,
        max: max,
        min: min,
        shuffle: shuffle,
        sample: sample,
        sortBy: sortBy,
        groupBy: groupBy,
        indexBy: indexBy,
        countBy: countBy,
        partition: partition,
        toArray: toArray,
        size: size,
        pick: pick,
        omit: omit,
        first: first,
        head: first,
        take: first,
        initial: initial,
        last: last,
        rest: rest,
        tail: rest,
        drop: rest,
        compact: compact,
        flatten: flatten,
        without: without,
        uniq: uniq,
        unique: uniq,
        union: union,
        intersection: intersection,
        difference: difference,
        unzip: unzip,
        transpose: unzip,
        zip: zip,
        object: object,
        range: range,
        chunk: chunk,
        mixin: mixin,
        'default': _$1
    };

    // Default Export

    // Add all of the Underscore functions to the wrapper object.
    var _ = mixin(allExports);
    // Legacy Node.js API.
    _._ = _;

    return _;

})));
//# sourceMappingURL=underscore-umd.js.map