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utils.ts
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/**
* Utility methods used by JSData.
*
* @example
* import { utils } from 'js-data';
* console.log(utils.isString('foo')); // true
*
* @namespace utils
* @type {Object}
*/
const DOMAIN = 'utils'
const INFINITY = 1 / 0
const MAX_INTEGER = 1.7976931348623157e308
const BOOL_TAG = '[object Boolean]'
const DATE_TAG = '[object Date]'
const FUNC_TAG = '[object Function]'
const NUMBER_TAG = '[object Number]'
const OBJECT_TAG = '[object Object]'
const REGEXP_TAG = '[object RegExp]'
const STRING_TAG = '[object String]'
const objToString = Object.prototype.toString
const PATH = /^(.+)\.(.+)$/
const ERRORS = {
'400' (...args) {
return `expected: ${args[0]}, found: ${args[2] ? args[1] : typeof args[1]}`
},
'404' (...args) {
return `${args[0]} not found`
}
}
const toInteger = value => {
if (!value) {
return 0
}
// Coerce to number
value = +value
if (value === INFINITY || value === -INFINITY) {
const sign = value < 0 ? -1 : 1
return sign * MAX_INTEGER
}
const remainder = value % 1
return value === value ? (remainder ? value - remainder : value) : 0; // eslint-disable-line
}
const toStr = value => objToString.call(value)
const isPlainObject = value => !!value && typeof value === 'object' && value.constructor === Object
const mkdirP = (object, path) => {
if (!path) {
return object
}
const parts = path.split('.')
parts.forEach(key => {
if (!object[key]) {
object[key] = {}
}
object = object[key]
})
return object
}
const utils = {
/**
* Shallow copy properties that meet the following criteria from `src` to
* `dest`:
*
* - own enumerable
* - not a function
* - does not start with "_"
*
* @method utils._
* @param {object} dest Destination object.
* @param {object} src Source object.
* @private
* @since 3.0.0
*/
_ (dest, src) {
utils.forOwn(src, (value, key) => {
if (key && dest[key] === undefined && !utils.isFunction(value) && key.indexOf('_') !== 0) {
dest[key] = value
}
})
},
/**
* Recursively iterates over relations found in `opts.with`.
*
* @method utils._forRelation
* @param {object} opts Configuration options.
* @param {Relation} def Relation definition.
* @param {Function} fn Callback function.
* @param {*} [thisArg] Execution context for the callback function.
* @private
* @since 3.0.0
*/
_forRelation (opts: any = {}, def, fn, thisArg) {
const relationName = def.relation
let containedName = null
let index
opts.with = opts.with || []
if ((index = utils._getIndex(opts.with, relationName)) >= 0) {
containedName = relationName
} else if ((index = utils._getIndex(opts.with, def.localField)) >= 0) {
containedName = def.localField
}
if (opts.withAll) {
fn.call(thisArg, def, {})
return
} else if (!containedName) {
return
}
const optsCopy: any = {}
utils.fillIn(optsCopy, def.getRelation())
utils.fillIn(optsCopy, opts)
optsCopy.with = opts.with.slice()
optsCopy._activeWith = optsCopy.with.splice(index, 1)[0]
optsCopy.with.forEach((relation, i) => {
if (
relation &&
relation.indexOf(containedName) === 0 &&
relation.length >= containedName.length &&
relation[containedName.length] === '.'
) {
optsCopy.with[i] = relation.substr(containedName.length + 1)
} else {
optsCopy.with[i] = ''
}
})
fn.call(thisArg, def, optsCopy)
},
/**
* Find the index of a relation in the given list
*
* @method utils._getIndex
* @param {string[]} list List to search.
* @param {string} relation Relation to find.
* @private
* @returns {number}
*/
_getIndex (list, relation) {
let index = -1
list.forEach((_relation, i) => {
if (_relation === relation) {
index = i
return false
} else if (utils.isObject(_relation)) {
if (_relation.relation === relation) {
index = i
return false
}
}
})
return index
},
/**
* Define hidden (non-enumerable), writable properties on `target` from the
* provided `props`.
*
* @example
* import { utils } from 'js-data';
* function Cat () {}
* utils.addHiddenPropsToTarget(Cat.prototype, {
* say () {
* console.log('meow');
* }
* });
* const cat = new Cat();
* cat.say(); // "meow"
*
* @method utils.addHiddenPropsToTarget
* @param {object} target That to which `props` should be added.
* @param {object} props Properties to be added to `target`.
* @since 3.0.0
*/
addHiddenPropsToTarget (target, props) {
const map = {}
Object.keys(props).forEach(propName => {
const descriptor = Object.getOwnPropertyDescriptor(props, propName)
descriptor.enumerable = false
map[propName] = descriptor
})
Object.defineProperties(target, map)
},
/**
* Return whether the two objects are deeply different.
*
* @example
* import { utils } from 'js-data';
* utils.areDifferent({}, {}); // false
* utils.areDifferent({ a: 1 }, { a: 1 }); // false
* utils.areDifferent({ foo: 'bar' }, {}); // true
*
* @method utils.areDifferent
* @param newObject
* @param oldObject
* @param {object} [opts] Configuration options.
* @param {Function} [opts.equalsFn={@link utils.deepEqual}] Equality function.
* @param {array} [opts.ignore=[]] Array of strings or RegExp of fields to ignore.
* @returns {boolean} Whether the two objects are deeply different.
* @see utils.diffObjects
* @since 3.0.0
*/
areDifferent (newObject, oldObject, opts: any = {}) {
const diff = utils.diffObjects(newObject, oldObject, opts)
const diffCount =
Object.keys(diff.added).length + Object.keys(diff.removed).length + Object.keys(diff.changed).length
return diffCount > 0
},
/**
* Deep copy a value.
*
* @example
* import { utils } from 'js-data';
* const a = { foo: { bar: 'baz' } };
* const b = utils.copy(a);
* a === b; // false
* utils.areDifferent(a, b); // false
*
* @param {*} from Value to deep copy.
* @param {*} [to] Destination object for the copy operation.
* @param {*} [stackFrom] For internal use.
* @param {*} [stackTo] For internal use.
* @param {string[]|RegExp[]} [blacklist] List of strings or RegExp of
* properties to skip.
* @param {boolean} [plain] Whether to make a plain copy (don't try to use
* original prototype).
* @returns {*} Deep copy of `from`.
* @since 3.0.0
*/
copy (from, to?, stackFrom?, stackTo?, blacklist?, plain?) {
if (!to) {
to = from
if (from) {
if (utils.isArray(from)) {
to = utils.copy(from, [], stackFrom, stackTo, blacklist, plain)
} else if (utils.isDate(from)) {
to = new Date(from.getTime())
} else if (utils.isRegExp(from)) {
to = new RegExp(from.source, from.toString().match(/[^/]*$/)[0])
to.lastIndex = from.lastIndex
} else if (utils.isObject(from)) {
if (plain) {
to = utils.copy(from, {}, stackFrom, stackTo, blacklist, plain)
} else {
to = utils.copy(from, Object.create(Object.getPrototypeOf(from)), stackFrom, stackTo, blacklist, plain)
}
}
}
} else {
if (from === to) {
throw utils.err(`${DOMAIN}.copy`)(500, 'Cannot copy! Source and destination are identical.')
}
stackFrom = stackFrom || []
stackTo = stackTo || []
if (utils.isObject(from)) {
const index = stackFrom.indexOf(from)
if (index !== -1) {
return stackTo[index]
}
stackFrom.push(from)
stackTo.push(to)
}
let result
if (utils.isArray(from)) {
let i
to.length = 0
for (i = 0; i < from.length; i++) {
result = utils.copy(from[i], null, stackFrom, stackTo, blacklist, plain)
if (utils.isObject(from[i])) {
stackFrom.push(from[i])
stackTo.push(result)
}
to.push(result)
}
} else {
if (utils.isArray(to)) {
to.length = 0
} else {
utils.forOwn(to, (value, key) => {
delete to[key]
})
}
for (const key in from) {
if (from.hasOwnProperty(key)) {
if (utils.isBlacklisted(key, blacklist)) {
continue
}
result = utils.copy(from[key], null, stackFrom, stackTo, blacklist, plain)
if (utils.isObject(from[key])) {
stackFrom.push(from[key])
stackTo.push(result)
}
to[key] = result
}
}
}
}
return to
},
/**
* Recursively shallow fill in own enumerable properties from `source` to
* `dest`.
*
* @example
* import { utils } from 'js-data';
* const a = { foo: { bar: 'baz' }, beep: 'boop' };
* const b = { beep: 'bip' };
* utils.deepFillIn(b, a);
* console.log(b); // {"foo":{"bar":"baz"},"beep":"bip"}
*
* @method utils.deepFillIn
* @param {object} dest The destination object.
* @param {object} source The source object.
* @see utils.fillIn
* @see utils.deepMixIn
* @since 3.0.0
*/
deepFillIn (dest, source?) {
if (source) {
utils.forOwn(source, (value, key) => {
const existing = dest[key]
if (isPlainObject(value) && isPlainObject(existing)) {
utils.deepFillIn(existing, value)
} else if (!dest.hasOwnProperty(key) || dest[key] === undefined) {
dest[key] = value
}
})
}
return dest
},
/**
* Recursively shallow copy enumerable properties from `source` to `dest`.
*
* @example
* import { utils } from 'js-data';
* const a = { foo: { bar: 'baz' }, beep: 'boop' };
* const b = { beep: 'bip' };
* utils.deepFillIn(b, a);
* console.log(b); // {"foo":{"bar":"baz"},"beep":"boop"}
*
* @method utils.deepMixIn
* @param {object} dest The destination object.
* @param {object} source The source object.
* @see utils.fillIn
* @see utils.deepFillIn
* @since 3.0.0
*/
deepMixIn (dest, source?) {
if (source) {
// tslint:disable-next-line:forin
for (const key in source) {
const value = source[key]
const existing = dest[key]
if (isPlainObject(value) && isPlainObject(existing)) {
utils.deepMixIn(existing, value)
} else {
dest[key] = value
}
}
}
return dest
},
/**
* Return a diff of the base object to the comparison object.
*
* @example
* import { utils } from 'js-data';
* const oldObject = { foo: 'bar', a: 1234 };
* const newObject = { beep: 'boop', a: 5678 };
* const diff = utils.diffObjects(oldObject, newObject);
* console.log(diff.added); // {"beep":"boop"}
* console.log(diff.changed); // {"a":5678}
* console.log(diff.removed); // {"foo":undefined}
*
* @method utils.diffObjects
* @param {object} newObject Comparison object.
* @param {object} oldObject Base object.
* @param {object} [opts] Configuration options.
* @param {Function} [opts.equalsFn={@link utils.deepEqual}] Equality function.
* @param {array} [opts.ignore=[]] Array of strings or RegExp of fields to ignore.
* @returns {Object} The diff from the base object to the comparison object.
* @see utils.areDifferent
* @since 3.0.0
*/
diffObjects (newObject, oldObject, opts: any = {}) {
let equalsFn = opts.equalsFn
const blacklist = opts.ignore
const diff = {
added: {},
changed: {},
removed: {}
}
if (!utils.isFunction(equalsFn)) {
equalsFn = utils.deepEqual
}
const newKeys = Object.keys(newObject).filter(key => !utils.isBlacklisted(key, blacklist))
const oldKeys = Object.keys(oldObject).filter(key => !utils.isBlacklisted(key, blacklist))
// Check for properties that were added or changed
newKeys.forEach(key => {
const oldValue = oldObject[key]
const newValue = newObject[key]
if (equalsFn(oldValue, newValue)) {
return
}
if (oldValue === undefined) {
diff.added[key] = newValue
} else {
diff.changed[key] = newValue
}
})
// Check for properties that were removed
oldKeys.forEach(key => {
const oldValue = oldObject[key]
const newValue = newObject[key]
if (newValue === undefined && oldValue !== undefined) {
diff.removed[key] = undefined
}
})
return diff
},
/**
* Return whether the two values are equal according to the `==` operator.
*
* @example
* import { utils } from 'js-data';
* console.log(utils.equal(1,1)); // true
* console.log(utils.equal(1,'1')); // true
* console.log(utils.equal(93, 66)); // false
*
* @method utils.equal
* @param {*} a First value in the comparison.
* @param {*} b Second value in the comparison.
* @returns {boolean} Whether the two values are equal according to `==`.
* @since 3.0.0
*/
equal (a, b) {
// tslint:disable-next-line:triple-equals
return a == b; // eslint-disable-line
},
/**
* Produce a factory function for making Error objects with the provided
* metadata. Used throughout the various js-data components.
*
* @example
* import { utils } from 'js-data';
* const errorFactory = utils.err('domain', 'target');
* const error400 = errorFactory(400, 'expected type', 'actual type');
* console.log(error400); // [Error: [domain:target] expected: expected type, found: string
* http://www.js-data.io/v3.0/docs/errors#400]
* @method utils.err
* @param {string} domain Namespace.
* @param {string} target Target.
* @returns {Function} Factory function.
* @since 3.0.0
*/
err (domain, target?) {
return (code, ...args) => {
const prefix = `[${domain}:${target}] `
let message = ERRORS[code].apply(null, args)
message = `${prefix}${message}
http://www.js-data.io/v3.0/docs/errors#${code}`
return new Error(message)
}
},
/**
* Add eventing capabilities into the target object.
*
* @example
* import { utils } from 'js-data';
* const user = { name: 'John' };
* utils.eventify(user);
* user.on('foo', () => console.log(arguments));
* user.emit('foo', 1, 'bar'); // should log to console values (1, "bar")
*
* @method utils.eventify
* @param {object} target Target object.
* @param {Function} [getter] Custom getter for retrieving the object's event
* listeners.
* @param {Function} [setter] Custom setter for setting the object's event
* listeners.
* @since 3.0.0
*/
eventify (target, getter?, setter?) {
target = target || this
let _events = {}
if (!getter && !setter) {
getter = () => _events
setter = value => (_events = value)
}
Object.defineProperties(target, {
emit: {
value (...args) {
const events = getter.call(this) || {}
const type = args.shift()
let listeners = events[type] || []
let i
for (i = 0; i < listeners.length; i++) {
listeners[i].f.apply(listeners[i].c, args)
}
listeners = events.all || []
args.unshift(type)
for (i = 0; i < listeners.length; i++) {
listeners[i].f.apply(listeners[i].c, args)
}
}
},
off: {
value (type, func) {
const events = getter.call(this)
const listeners = events[type]
if (!listeners) {
setter.call(this, {})
} else if (func) {
for (let i = 0; i < listeners.length; i++) {
if (listeners[i].f === func) {
listeners.splice(i, 1)
break
}
}
} else {
listeners.splice(0, listeners.length)
}
}
},
on: {
value (type, func, thisArg) {
if (!getter.call(this)) {
setter.call(this, {})
}
const events = getter.call(this)
events[type] = events[type] || []
events[type].push({
c: thisArg,
f: func
})
}
}
})
},
/**
* Shallow copy own enumerable properties from `src` to `dest` that are on
* `src` but are missing from `dest.
*
* @example
* import { utils } from 'js-data';
* const a = { foo: 'bar', beep: 'boop' };
* const b = { beep: 'bip' };
* utils.fillIn(b, a);
* console.log(b); // {"foo":"bar","beep":"bip"}
*
* @method utils.fillIn
* @param {object} dest The destination object.
* @param src
* @see utils.deepFillIn
* @see utils.deepMixIn
* @since 3.0.0
*/
fillIn (dest, src) {
utils.forOwn(src, (value, key) => {
if (!dest.hasOwnProperty(key) || dest[key] === undefined) {
dest[key] = value
}
})
},
/**
* Find the last index of an item in an array according to the given checker function.
*
* @example
* import { utils } from 'js-data';
*
* const john = { name: 'John', age: 20 };
* const sara = { name: 'Sara', age: 25 };
* const dan = { name: 'Dan', age: 20 };
* const users = [john, sara, dan];
*
* console.log(utils.findIndex(users, (user) => user.age === 25)); // 1
* console.log(utils.findIndex(users, (user) => user.age > 19)); // 2
* console.log(utils.findIndex(users, (user) => user.name === 'John')); // 0
* console.log(utils.findIndex(users, (user) => user.name === 'Jimmy')); // -1
*
* @method utils.findIndex
* @param {array} array The array to search.
* @param {Function} fn Checker function.
* @returns {number} Index if found or -1 if not found.
* @since 3.0.0
*/
findIndex (array, fn) {
let index = -1
if (!array) {
return index
}
array.forEach((record, i) => {
if (fn(record)) {
index = i
return false
}
})
return index
},
/**
* Recursively iterate over a {@link Mapper}'s relations according to
* `opts.with`.
*
* @method utils.forEachRelation
* @param {Mapper} mapper Mapper.
* @param {object} opts Configuration options.
* @param {Function} fn Callback function.
* @param {*} thisArg Execution context for the callback function.
* @since 3.0.0
*/
forEachRelation (mapper, opts, fn, thisArg?) {
const relationList = mapper.relationList || []
if (!relationList.length) {
return
}
relationList.forEach(def => {
utils._forRelation(opts, def, fn, thisArg)
})
},
/**
* Iterate over an object's own enumerable properties.
*
* @example
* import { utils } from 'js-data';
* const a = { b: 1, c: 4 };
* let sum = 0;
* utils.forOwn(a, function (value, key) {
* sum += value;
* });
* console.log(sum); // 5
*
* @method utils.forOwn
* @param obj
* @param {Function} fn Iteration function.
* @param {object} [thisArg] Content to which to bind `fn`.
* @since 3.0.0
*/
forOwn (obj, fn, thisArg?) {
const keys = Object.keys(obj)
const len = keys.length
let i
for (i = 0; i < len; i++) {
if (fn.call(thisArg, obj[keys[i]], keys[i], obj) === false) {
break
}
}
},
/**
* Proxy for `JSON.parse`.
*
* @example
* import { utils } from 'js-data';
*
* const a = utils.fromJson('{"name" : "John"}');
* console.log(a); // { name: 'John' }
*
* @method utils.fromJson
* @param {string} json JSON to parse.
* @returns {Object} Parsed object.
* @see utils.toJson
* @since 3.0.0
*/
fromJson (json) {
return utils.isString(json) ? JSON.parse(json) : json
},
/**
* Retrieve the specified property from the given object. Supports retrieving
* nested properties.
*
* @example
* import { utils } from 'js-data';
* const a = { foo: { bar: 'baz' }, beep: 'boop' };
* console.log(utils.get(a, 'beep')); // "boop"
* console.log(utils.get(a, 'foo.bar')); // "baz"
*
* @method utils.get
* @param {object} object Object from which to retrieve a property's value.
* @param {string} prop Property to retrieve.
* @returns {*} Value of the specified property.
* @see utils.set
* @since 3.0.0
*/
get (object, prop) {
if (!prop) {
return
}
/* if prop is function, get the property by calling a function, passing an object as a parameter */
if (utils.isFunction(prop)) {
return prop(object)
}
const parts = prop.split('.')
const last = parts.pop()
while ((prop = parts.shift())) {
// eslint-disable-line
object = object[prop]
if (object == null) {
// eslint-disable-line
return
}
}
return object[last]
},
/**
* Return the superclass for the given instance or subclass. If an instance is
* provided, then finds the parent class of the instance's constructor.
*
* @example
* import { utils } from 'js-data';
* // using ES2015 classes
* class Foo {}
* class Bar extends Foo {}
* const barInstance = new Bar();
* let baseType = utils.getSuper(barInstance);
* console.log(Foo === baseType); // true
*
* // using Function constructor with utils.extend
* function Foo () {}
* Foo.extend = utils.extend;
* const Bar = Foo.extend();
* const barInstance = new Bar();
* let baseType = utils.getSuper(barInstance);
* console.log(Foo === baseType); // true
*
* @method utils.getSuper
* @param {Object|Function} instance Instance or constructor.
* @param {boolean} [isCtor=false] Whether `instance` is a constructor.
* @returns {Constructor} The superclass (grandparent constructor).
* @since 3.0.0
*/
getSuper (instance, isCtor?) {
const ctor = isCtor ? instance : instance.constructor
if (ctor.hasOwnProperty('__super__')) {
return ctor.__super__
}
return Object.getPrototypeOf(ctor) || ctor.__proto__; // eslint-disable-line
},
/**
* Return the intersection of two arrays.
*
* @example
* import { utils } from 'js-data';
* const arrA = ['green', 'red', 'blue', 'red'];
* const arrB = ['green', 'yellow', 'red'];
* const intersected = utils.intersection(arrA, arrB);
*
* console.log(intersected); // ['green', 'red'])
*
* @method utils.intersection
* @param {array} array1 First array.
* @param {array} array2 Second array.
* @returns {Array} Array of elements common to both arrays.
* @since 3.0.0
*/
intersection (array1, array2) {
if (!array1 || !array2) {
return []
}
array1 = Array.isArray(array1) ? array1 : [array1]
array2 = Array.isArray(array2) ? array2 : [array2]
const result = []
let item
let i
const len = array1.length
for (i = 0; i < len; i++) {
item = array1[i]
if (result.indexOf(item) !== -1) {
continue
}
if (array2.indexOf(item) !== -1) {
result.push(item)
}
}
return result
},
/**
* Proxy for `Array.isArray`.
*
* @example
* import { utils } from 'js-data';
* const a = [1,2,3,4,5];
* const b = { foo: "bar" };
* console.log(utils.isArray(a)); // true
* console.log(utils.isArray(b)); // false
*
* @method utils.isArray
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is an array.
* @since 3.0.0
*/
isArray: Array.isArray,
/**
* Return whether `prop` is matched by any string or regular expression in
* `blacklist`.
*
* @example
* import { utils } from 'js-data';
* const blacklist = [/^\$hashKey/g, /^_/g, 'id'];
* console.log(utils.isBlacklisted("$hashKey", blacklist)); // true
* console.log(utils.isBlacklisted("id", blacklist)); // true
* console.log(utils.isBlacklisted("_myProp", blacklist)); // true
* console.log(utils.isBlacklisted("my_id", blacklist)); // false
*
* @method utils.isBlacklisted
* @param {string} prop The name of a property to check.
* @param {array} blacklist Array of strings and regular expressions.
* @returns {boolean} Whether `prop` was matched.
* @since 3.0.0
*/
isBlacklisted (prop, blacklist) {
if (!blacklist || !blacklist.length) {
return false
}
let matches
for (const item of blacklist) {
if ((toStr(item) === REGEXP_TAG && item.test(prop)) || item === prop) {
matches = prop
return !!matches
}
}
return !!matches
},
/**
* Return whether the provided value is a boolean.
*
* @example
* import { utils } from 'js-data';
* const a = true;
* const b = { foo: "bar" };
* console.log(utils.isBoolean(a)); // true
* console.log(utils.isBoolean(b)); // false
*
* @method utils.isBoolean
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a boolean.
* @since 3.0.0
*/
isBoolean (value) {
return toStr(value) === BOOL_TAG
},
/**
* Return whether the provided value is a date.
*
* @example
* import { utils } from 'js-data';
* const a = new Date();
* const b = { foo: "bar" };
* console.log(utils.isDate(a)); // true
* console.log(utils.isDate(b)); // false
*
* @method utils.isDate
* @param {*} value The value to test.
* @returns {Date} Whether the provided value is a date.
* @since 3.0.0
*/
isDate (value) {
return value && typeof value === 'object' && toStr(value) === DATE_TAG
},
/**
* Return whether the provided value is a function.
*
* @example
* import { utils } from 'js-data';
* const a = function () { console.log('foo bar'); };
* const b = { foo: "bar" };
* console.log(utils.isFunction(a)); // true
* console.log(utils.isFunction(b)); // false
*
* @method utils.isFunction
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a function.
* @since 3.0.0
*/
isFunction (value) {
return typeof value === 'function' || (value && toStr(value) === FUNC_TAG)
},
/**
* Return whether the provided value is an integer.
*
* @example
* import { utils } from 'js-data';
* const a = 1;
* const b = 1.25;
* const c = '1';
* console.log(utils.isInteger(a)); // true
* console.log(utils.isInteger(b)); // false
* console.log(utils.isInteger(c)); // false
*
* @method utils.isInteger
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is an integer.
* @since 3.0.0
*/
isInteger (value) {
// tslint:disable-next-line:triple-equals
return toStr(value) === NUMBER_TAG && value == toInteger(value); // eslint-disable-line
},
/**
* Return whether the provided value is `null`.
*
* @example
* import { utils } from 'js-data';
* const a = null;
* const b = { foo: "bar" };
* console.log(utils.isNull(a)); // true
* console.log(utils.isNull(b)); // false
*
* @method utils.isNull
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is `null`.
* @since 3.0.0
*/
isNull (value) {
return value === null
},
/**
* Return whether the provided value is a number.
*
* @example
* import { utils } from 'js-data';
* const a = 1;
* const b = -1.25;
* const c = '1';
* console.log(utils.isNumber(a)); // true
* console.log(utils.isNumber(b)); // true
* console.log(utils.isNumber(c)); // false
*
* @method utils.isNumber
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is a number.
* @since 3.0.0
*/
isNumber (value) {
const type = typeof value
return type === 'number' || (value && type === 'object' && toStr(value) === NUMBER_TAG)
},
/**
* Return whether the provided value is an object.
*
* @example
* import { utils } from 'js-data';
* const a = { foo: "bar" };
* const b = 'foo bar';
* console.log(utils.isObject(a)); // true
* console.log(utils.isObject(b)); // false
*
* @method utils.isObject
* @param {*} value The value to test.
* @returns {boolean} Whether the provided value is an object.
* @since 3.0.0
*/
isObject (value) {
return toStr(value) === OBJECT_TAG
},
/**