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<!doctype html>
<html>
<head>
<link rel="stylesheet" href="../api_static/tomorrow-night.css">
<link rel="stylesheet" href="../api_static/style.css" type="text/css">
<script src="../api_static//highlight.pack.js"></script>
<script src="../api_static//script.js"></script>
<script>hljs.initHighlightingOnLoad();</script>
<meta charset="utf8">
<link rel="previous" href="Belt_Id.html"><link rel="next" href="Belt_Map.html">
<title> Belt_List </title></head>
<body>
<nav class="module-index"><ul><li><a href="Belt.html">Belt</a></li>
<li><a href="Belt_Array.html">Belt_Array</a></li>
<li><a href="Belt_HashMap.html">Belt_HashMap</a></li>
<li><a href="Belt_HashMapInt.html">Belt_HashMapInt</a></li>
<li><a href="Belt_HashMapString.html">Belt_HashMapString</a></li>
<li><a href="Belt_HashSet.html">Belt_HashSet</a></li>
<li><a href="Belt_HashSetInt.html">Belt_HashSetInt</a></li>
<li><a href="Belt_HashSetString.html">Belt_HashSetString</a></li>
<li><a href="Belt_Id.html">Belt_Id</a></li>
<li><a href="Belt_List.html">Belt_List</a></li>
<li><a href="Belt_Map.html">Belt_Map</a></li>
<li><a href="Belt_MapDict.html">Belt_MapDict</a></li>
<li><a href="Belt_MapInt.html">Belt_MapInt</a></li>
<li><a href="Belt_MapString.html">Belt_MapString</a></li>
<li><a href="Belt_MutableMap.html">Belt_MutableMap</a></li>
<li><a href="Belt_MutableMapInt.html">Belt_MutableMapInt</a></li>
<li><a href="Belt_MutableMapString.html">Belt_MutableMapString</a></li>
<li><a href="Belt_MutableQueue.html">Belt_MutableQueue</a></li>
<li><a href="Belt_MutableSet.html">Belt_MutableSet</a></li>
<li><a href="Belt_MutableSetInt.html">Belt_MutableSetInt</a></li>
<li><a href="Belt_MutableSetString.html">Belt_MutableSetString</a></li>
<li><a href="Belt_MutableStack.html">Belt_MutableStack</a></li>
<li><a href="Belt_Option.html">Belt_Option</a></li>
<li><a href="Belt_Range.html">Belt_Range</a></li>
<li><a href="Belt_Set.html">Belt_Set</a></li>
<li><a href="Belt_SetDict.html">Belt_SetDict</a></li>
<li><a href="Belt_SetInt.html">Belt_SetInt</a></li>
<li><a href="Belt_SetString.html">Belt_SetString</a></li>
<li><a href="Belt_SortArray.html">Belt_SortArray</a></li>
<li><a href="Belt_SortArrayInt.html">Belt_SortArrayInt</a></li>
<li><a href="Belt_SortArrayString.html">Belt_SortArrayString</a></li>
<li><a href="Belt_internalAVLset.html">Belt_internalAVLset</a></li>
<li><a href="Belt_internalAVLtree.html">Belt_internalAVLtree</a></li>
<li><a href="Belt_internalBuckets.html">Belt_internalBuckets</a></li>
<li><a href="Belt_internalBucketsType.html">Belt_internalBucketsType</a></li>
<li><a href="Belt_internalMapInt.html">Belt_internalMapInt</a></li>
<li><a href="Belt_internalMapString.html">Belt_internalMapString</a></li>
<li><a href="Belt_internalMutableAVLMap.html">Belt_internalMutableAVLMap</a></li>
<li><a href="Belt_internalSetBuckets.html">Belt_internalSetBuckets</a></li>
<li><a href="Belt_internalSetInt.html">Belt_internalSetInt</a></li>
<li><a href="Belt_internalSetString.html">Belt_internalSetString</a></li>
<li><a href="Dom.html">Dom</a></li>
<li><a href="Dom_storage.html">Dom_storage</a></li>
<li><a href="Js.html">Js</a></li>
<li><a href="Js_array.html">Js_array</a></li>
<li><a href="Js_boolean.html">Js_boolean</a></li>
<li><a href="Js_cast.html">Js_cast</a></li>
<li><a href="Js_console.html">Js_console</a></li>
<li><a href="Js_date.html">Js_date</a></li>
<li><a href="Js_dict.html">Js_dict</a></li>
<li><a href="Js_exn.html">Js_exn</a></li>
<li><a href="Js_float.html">Js_float</a></li>
<li><a href="Js_global.html">Js_global</a></li>
<li><a href="Js_int.html">Js_int</a></li>
<li><a href="Js_int64.html">Js_int64</a></li>
<li><a href="Js_internal.html">Js_internal</a></li>
<li><a href="Js_json.html">Js_json</a></li>
<li><a href="Js_list.html">Js_list</a></li>
<li><a href="Js_mapperRt.html">Js_mapperRt</a></li>
<li><a href="Js_math.html">Js_math</a></li>
<li><a href="Js_nativeint.html">Js_nativeint</a></li>
<li><a href="Js_null.html">Js_null</a></li>
<li><a href="Js_null_undefined.html">Js_null_undefined</a></li>
<li><a href="Js_obj.html">Js_obj</a></li>
<li><a href="Js_option.html">Js_option</a></li>
<li><a href="Js_primitive.html">Js_primitive</a></li>
<li><a href="Js_promise.html">Js_promise</a></li>
<li><a href="Js_re.html">Js_re</a></li>
<li><a href="Js_result.html">Js_result</a></li>
<li><a href="Js_string.html">Js_string</a></li>
<li><a href="Js_typed_array.html">Js_typed_array</a></li>
<li><a href="Js_types.html">Js_types</a></li>
<li><a href="Js_undefined.html">Js_undefined</a></li>
<li><a href="Js_unsafe.html">Js_unsafe</a></li>
<li><a href="Js_vector.html">Js_vector</a></li>
<li><a href="Node.html">Node</a></li>
<li><a href="Node_buffer.html">Node_buffer</a></li>
<li><a href="Node_child_process.html">Node_child_process</a></li>
<li><a href="Node_fs.html">Node_fs</a></li>
<li><a href="Node_module.html">Node_module</a></li>
<li><a href="Node_path.html">Node_path</a></li>
<li><a href="Node_process.html">Node_process</a></li></ul></nav>
<div class="navbar"><a class="pre" href="Belt_Id.html" title="Belt_Id">Previous</a>
<a class="up" href="index.html" title="Index">Up</a>
<a class="post" href="Belt_Map.html" title="Belt_Map">Next</a>
</div>
<h1>Module <a href="type_Belt_List.html">Belt_List</a></h1>
<pre><span class="keyword">module</span> Belt_List: <code class="code">sig</code> <a href="Belt_List.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="not-examples">
<a href="Belt.List.html"><code class="code">Belt.List</code></a>
<p>
Utilities for List data type.
<p>
This module is compatible with original ocaml stdlib.
In general, all functions comes with the original stdlib also
applies to this collection, however, this module provides faster
and stack safer utilities<br>
</div>
</div>
<hr width="100%">
<div class="type-declaration">
<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type">'a</code> t</span> = <code class="type">'a list</code> </pre>
</div>
<div class="info ">
<div class="not-examples">
<code class="code">'a t</code> is compatible with built-in <code class="code">list</code> type<br>
</div>
</div>
<pre><span id="VALlength"><span class="keyword">val</span> length</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> int</code></pre><div class="info ">
<div class="not-examples">
<code class="code">length l</code><br>
<div class="tag"> <b>Returns</b> the length of the list <code class="code">l</code><br>
</div>
</div>
</div>
<pre><span id="VALsize"><span class="keyword">val</span> size</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> int</code></pre><div class="info ">
<div class="not-examples">
<b>See</b> <a href="Belt_List.html#VALlength"><code class="code">Belt_List.length</code></a><br>
</div>
</div>
<pre><span id="VALhead"><span class="keyword">val</span> head</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a option</code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> head [] = None ;;
head [1;2;3] = Some 1 ;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALheadExn"><span class="keyword">val</span> headExn</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a</code></pre><div class="info ">
<div class="not-examples">
<code class="code">headExn h</code>
<p>
<b>See</b> <a href="Belt_List.html#VALhead"><code class="code">Belt_List.head</code></a>
<p>
<b>raise</b> an exception if <code class="code">h</code> is empty<br>
</div>
</div>
<pre><span id="VALtail"><span class="keyword">val</span> tail</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> option</code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> tail [] = None ;;
tail [1;2] = Some [2];;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtailExn"><span class="keyword">val</span> tailExn</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">tailExn h</code>
<p>
<b>See</b> <a href="Belt_List.html#VALtail"><code class="code">Belt_List.tail</code></a>
<p>
<b>raise</b> an exception if <code class="code">h</code> is empty<br>
</div>
</div>
<pre><span id="VALadd"><span class="keyword">val</span> add</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> add [1] 3 = [3;1];;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALget"><span class="keyword">val</span> get</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> int -> 'a option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">get xs n</code>
<p>
return the nth element in <code class="code">xs</code>,
or <code class="code">None</code> if <code class="code">n</code> is larger than the length<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> get [0;3;32] 2 = Some 2 ;;
get [0;3;32] 3 = None;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALgetExn"><span class="keyword">val</span> getExn</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> int -> 'a</code></pre><div class="info ">
<div class="not-examples">
<code class="code">getExn xs n</code>
<p>
<b>See</b> <a href="Belt_List.html#VALget"><code class="code">Belt_List.get</code></a>
<p>
<b>raise</b> an exception if <code class="code">n</code> is larger than the length<br>
</div>
</div>
<pre><span id="VALmake"><span class="keyword">val</span> make</span> : <code class="type">int -> 'a -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">make n v</code>
<p>
<ul>
<li>return a list of length <code class="code">n</code> with each element filled with <code class="code">v</code> </li>
<li>return the empty list if <code class="code">n</code> is negative</li>
</ul>
<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> make 3 1 = [1;1;1]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALmakeByU"><span class="keyword">val</span> makeByU</span> : <code class="type">int -> (int -> 'a [@bs]) -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALmakeBy"><span class="keyword">val</span> makeBy</span> : <code class="type">int -> (int -> 'a) -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">makeBy n f</code>
<p>
<ul>
<li>return a list of length <code class="code">n</code> with element <code class="code">i</code> initialized with <code class="code">f i</code></li>
<li>return the empty list if <code class="code">n</code> is negative</li>
</ul>
<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> makeBy 5 (fun i -> i) = [0;1;2;3;4]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALshuffle"><span class="keyword">val</span> shuffle</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">shuffle xs</code><br>
<div class="tag"> <b>Returns</b> a new list in random order<br>
</div>
</div>
</div>
<pre><span id="VALdrop"><span class="keyword">val</span> drop</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> int -> 'a <a href="Belt_List.html#TYPEt">t</a> option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">drop xs n</code>
<p>
return the list obtained by dropping the first <code class="code">n</code> elements,
or <code class="code">None</code> if <code class="code">xs</code> has fewer than <code class="code">n</code> elements<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> drop [1;2;3] 2 = Some [3];;
drop [1;2;3] 3 = Some [];;
drop [1;2;3] 4 = None;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtake"><span class="keyword">val</span> take</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> int -> 'a <a href="Belt_List.html#TYPEt">t</a> option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">take xs n</code>
<p>
return a list with the first <code class="code">n</code> elements from <code class="code">xs</code>,
or <code class="code">None</code> if <code class="code">xs</code> has fewer than <code class="code">n</code> elements<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> take [1;2;3] 1 = Some [1];;
take [1;2;3] 2 = Some [1;2];;
take [1;2;3] 4 = None;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALsplitAt"><span class="keyword">val</span> splitAt</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> int -> ('a list * 'a list) option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">splitAt xs n</code>
split the list <code class="code">xs</code> at position <code class="code">n</code>
return None when the length of <code class="code">xs</code> is less than <code class="code">n</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> splitAt [0;1;2;3;4] 2 = Some ([0;1], [2;3;4])
</code></pre> </pre>
</div>
</div>
<pre><span id="VALconcat"><span class="keyword">val</span> concat</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">concat xs ys</code><br>
<div class="tag"> <b>Returns</b> the list obtained by adding <code class="code">ys</code> after <code class="code">xs</code><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> concat [1;2;3] [4;5] = [1;2;3;4;5]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALconcatMany"><span class="keyword">val</span> concatMany</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> array -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">concatMany a</code>
return the list obtained by concatenating in order all the lists in array <code class="code">a</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> concatMany [| [1;2;3] ; []; [3]; [4] |] = [1;2;3;3;4]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALreverseConcat"><span class="keyword">val</span> reverseConcat</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">reverseConcat xs ys</code> is equivalent to <code class="code">concat (reverse xs) ys</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> reverseConcat [1;2] [3;4] = [2;1;3;4]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALflatten"><span class="keyword">val</span> flatten</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">flatten ls</code>
return the list obtained by concatenating in order all the lists in list <code class="code">ls</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> flatten [ [1;2;3] ; []; [3]; [4] ] = [1;2;3;3;4]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALmapU"><span class="keyword">val</span> mapU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b [@bs]) -> 'b <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALmap"><span class="keyword">val</span> map</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b) -> 'b <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">map xs f</code>
<p>
return the list obtained by applying <code class="code">f</code> to the element of <code class="code">xs</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> map [1;2] (fun x-> x + 1) = [3;4]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALzip"><span class="keyword">val</span> zip</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a * 'b) <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">zip xs ys</code><br>
<div class="tag"> <b>Returns</b> a list of pairs from the two lists
with the length of the shorter list<br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> zip [1;2] [1;2;3] = [(1,1); (2,2)]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALzipByU"><span class="keyword">val</span> zipByU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> 'c [@bs]) -> 'c <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALzipBy"><span class="keyword">val</span> zipBy</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> 'c) -> 'c <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">zipBy xs ys f</code>
<p>
<b>See</b> <a href="Belt_List.html#VALzip"><code class="code">Belt_List.zip</code></a>
<p>
Equivalent to <code class="code">zip xs ys |> List.map (fun (x,y) -> f x y)</code><br>
</div>
</div>
<pre><span id="VALmapWithIndexU"><span class="keyword">val</span> mapWithIndexU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> (int -> 'a -> 'b [@bs]) -> 'b <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALmapWithIndex"><span class="keyword">val</span> mapWithIndex</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> (int -> 'a -> 'b) -> 'b <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> mapWithIndex [1;2;3] (fun i x -> i + x) =
[0 + 1; 1 + 2; 2 + 3 ]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALofArray"><span class="keyword">val</span> ofArray</span> : <code class="type">'a array -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALfromArray"><span class="keyword">val</span> fromArray</span> : <code class="type">'a array -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> fromArray [|1;2;3|] = [1;2;3]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoArray"><span class="keyword">val</span> toArray</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a array</code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> toArray [1;2;3] = [|1;2;3|]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALreverse"><span class="keyword">val</span> reverse</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> reverse [1;2;3] = [3;2;1]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALmapReverseU"><span class="keyword">val</span> mapReverseU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b [@bs]) -> 'b <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALmapReverse"><span class="keyword">val</span> mapReverse</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b) -> 'b <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">mapReverse a f</code>
<p>
Equivalent to <code class="code">reverse (map a f)</code><br>
</div>
</div>
<pre><span id="VALforEachU"><span class="keyword">val</span> forEachU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b [@bs]) -> unit</code></pre>
<pre><span id="VALforEach"><span class="keyword">val</span> forEach</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b) -> unit</code></pre><div class="info ">
<div class="not-examples">
<code class="code">forEach xs f </code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> let us = ref 0;;
forEach [1;2;3;4] (fun x -> us := !us + x);;
!us = 1 + 2 + 3 + 4;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALforEachWithIndexU"><span class="keyword">val</span> forEachWithIndexU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> (int -> 'a -> 'b [@bs]) -> unit</code></pre>
<pre><span id="VALforEachWithIndex"><span class="keyword">val</span> forEachWithIndex</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> (int -> 'a -> 'b) -> unit</code></pre><div class="info ">
<div class="not-examples">
<code class="code">forEachWithIndex xs f</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> let us = ref 0 ;;
forEachWithIndex [1;1;1;1] (fun i x -> us := !us + x + i);;
!us = 0 + 1 + 1 + 1 + 2 + 1 + 3 + 1;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALreduceU"><span class="keyword">val</span> reduceU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('b -> 'a -> 'b [@bs]) -> 'b</code></pre>
<pre><span id="VALreduce"><span class="keyword">val</span> reduce</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('b -> 'a -> 'b) -> 'b</code></pre><div class="info ">
<div class="not-examples">
<code class="code">reduce xs f</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> reduce [1;2;3;4] 0 (+) = 10;;
reduce [1;2;3;4] 10 (-) = 0;;
reduce [1;2;3;4] [] add = [4;3;2;1];
</code></pre> </pre>
</div>
</div>
<pre><span id="VALreduceReverseU"><span class="keyword">val</span> reduceReverseU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('b -> 'a -> 'b [@bs]) -> 'b</code></pre>
<pre><span id="VALreduceReverse"><span class="keyword">val</span> reduceReverse</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('b -> 'a -> 'b) -> 'b</code></pre><div class="info ">
<div class="not-examples">
<code class="code">reduceReverse xs f</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> reduceReverse [1;2;3;4] 0 (+) = 10;;
reduceReverse [1;2;3;4] 10 (-) = 0;;
reduceReverse [1;2;3;4] [] add = [1;2;3;4];;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALmapReverse2U"><span class="keyword">val</span> mapReverse2U</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> 'c [@bs]) -> 'c <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALmapReverse2"><span class="keyword">val</span> mapReverse2</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> 'c) -> 'c <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">mapReverse2 xs ys f</code>
<p>
equivalent to <code class="code">reverse (zipBy xs ys f)</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> mapReverse2 [1;2;3] [1;2] (+) = [4;2]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALforEach2U"><span class="keyword">val</span> forEach2U</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> 'c [@bs]) -> unit</code></pre>
<pre><span id="VALforEach2"><span class="keyword">val</span> forEach2</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> 'c) -> unit</code></pre><div class="info ">
<div class="not-examples">
<code class="code">forEach2 xs ys f</code> stop with the shorter list<br>
</div>
</div>
<pre><span id="VALreduce2U"><span class="keyword">val</span> reduce2U</span> : <code class="type">'b <a href="Belt_List.html#TYPEt">t</a> -> 'c <a href="Belt_List.html#TYPEt">t</a> -> 'a -> ('a -> 'b -> 'c -> 'a [@bs]) -> 'a</code></pre>
<pre><span id="VALreduce2"><span class="keyword">val</span> reduce2</span> : <code class="type">'b <a href="Belt_List.html#TYPEt">t</a> -> 'c <a href="Belt_List.html#TYPEt">t</a> -> 'a -> ('a -> 'b -> 'c -> 'a) -> 'a</code></pre><div class="info ">
<div class="not-examples">
<code class="code">reduce2 xs ys init f </code>
<p>
stops with the shorter list.<br>
</div>
</div>
<pre><span id="VALreduceReverse2U"><span class="keyword">val</span> reduceReverse2U</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> 'c -> ('c -> 'a -> 'b -> 'c [@bs]) -> 'c</code></pre>
<pre><span id="VALreduceReverse2"><span class="keyword">val</span> reduceReverse2</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> 'c -> ('c -> 'a -> 'b -> 'c) -> 'c</code></pre><div class="info ">
<div class="not-examples">
<code class="code">reduceReverse2 xs ys init f </code>
<p>
Stops with the shorter list<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> reduceReverse2 [1;2;3] [1;2] 0 (fun acc x y -> acc + x + y) = 6
</code></pre> </pre>
</div>
</div>
<pre><span id="VALeveryU"><span class="keyword">val</span> everyU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool [@bs]) -> bool</code></pre>
<pre><span id="VALevery"><span class="keyword">val</span> every</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool) -> bool</code></pre><div class="info ">
<div class="not-examples">
<code class="code">every ls p</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> every [] (fun x -> x mod 2 = 0) = true;;
every [2;4] (fun x -> x mod 2 = 0 ) true;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALsomeU"><span class="keyword">val</span> someU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool [@bs]) -> bool</code></pre>
<pre><span id="VALsome"><span class="keyword">val</span> some</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool) -> bool</code></pre><div class="info ">
<div class="not-examples">
<code class="code">some ls p</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> some [] (fun x -> x mod 2 = 0) = false ;;
some [1;2] (fun x -> x mod 2 = 0) = true;;)
</code></pre> </pre>
</div>
</div>
<pre><span id="VALevery2U"><span class="keyword">val</span> every2U</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> bool [@bs]) -> bool</code></pre>
<pre><span id="VALevery2"><span class="keyword">val</span> every2</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> bool) -> bool</code></pre><div class="info ">
<div class="not-examples">
<code class="code">every2 xs ys p</code> stop with the shorter list<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> (every2 [] [1] (fun x y -> x > y)) = true;;
(every2 [2;3] [1] (fun x y -> x > y)) = true;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALsome2U"><span class="keyword">val</span> some2U</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> bool [@bs]) -> bool</code></pre>
<pre><span id="VALsome2"><span class="keyword">val</span> some2</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b -> bool) -> bool</code></pre><div class="info ">
<div class="not-examples">
<code class="code">some2 xs ys p</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> (some2 [] [1] (fun x y -> x > y)) = false;;
(some2 [2;3] [1;4] (fun x y -> x > y)) = true;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALcmpByLength"><span class="keyword">val</span> cmpByLength</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> -> int</code></pre><div class="info ">
<div class="not-examples">
<code class="code">cmpByLength l1 l2</code>
<p>
Compare two lists solely by length<br>
</div>
</div>
<pre><span id="VALcmpU"><span class="keyword">val</span> cmpU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'a -> int [@bs]) -> int</code></pre>
<pre><span id="VALcmp"><span class="keyword">val</span> cmp</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'a -> int) -> int</code></pre><div class="info ">
<div class="not-examples">
<code class="code">cmp xs ys cmpElem</code>
compare lists <code class="code">xs</code> and <code class="code">ys</code> using <code class="code">cmpElem</code> to compare elements<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> cmp [1;2;3] [1;2;3] compare = 0;;
cmp [1;2;3] [0;1;2;3] compare = 1 ;;]
</code></pre>
<p>
<b>Attention</b>: The total ordering of List is different from Array,
for Array, we compare the length first and one by one later, while
for lists, we just compare one by one </pre>
</div>
</div>
<pre><span id="VALeqU"><span class="keyword">val</span> eqU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'a -> bool [@bs]) -> bool</code></pre>
<pre><span id="VALeq"><span class="keyword">val</span> eq</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'a -> bool) -> bool</code></pre><div class="info ">
<div class="not-examples">
<code class="code">eq xs ys eqElem</code>
check equality of <code class="code">xs</code> and <code class="code">ys</code> using <code class="code">eqElem</code> for equality on elements<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> eq [1;2;3] [1;2] (=) = false ;;
eq [1;2] [1;2] (=) = true
</code></pre> </pre>
</div>
</div>
<pre><span id="VALhasU"><span class="keyword">val</span> hasU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('a -> 'b -> bool [@bs]) -> bool</code></pre>
<pre><span id="VALhas"><span class="keyword">val</span> has</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('a -> 'b -> bool) -> bool</code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> has [1;2;3] 2 (=) = true;;
has [1;2;3] 4 (=) = false;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALgetByU"><span class="keyword">val</span> getByU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool [@bs]) -> 'a option</code></pre>
<pre><span id="VALgetBy"><span class="keyword">val</span> getBy</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool) -> 'a option</code></pre><div class="info ">
<div class="not-examples">
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> getBy [1;4;3;2] (fun x -> x mod 2 = 0) = Some 4
</code></pre> </pre>
</div>
</div>
<pre><span id="VALkeepU"><span class="keyword">val</span> keepU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool [@bs]) -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALkeep"><span class="keyword">val</span> keep</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool) -> 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">keep xs p</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> keep [1;2;3;4] (fun x -> x mod 2 = 0) =
[2;4]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALkeepMapU"><span class="keyword">val</span> keepMapU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b option [@bs]) -> 'b <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALkeepMap"><span class="keyword">val</span> keepMap</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> 'b option) -> 'b <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">keepMap xs f</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> keepMap [1;2;3;4] (fun x -> if x mod 2 = 0 then Some (-x ) else None)
=
[-2;-4]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALpartitionU"><span class="keyword">val</span> partitionU</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool [@bs]) -> 'a <a href="Belt_List.html#TYPEt">t</a> * 'a <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALpartition"><span class="keyword">val</span> partition</span> : <code class="type">'a <a href="Belt_List.html#TYPEt">t</a> -> ('a -> bool) -> 'a <a href="Belt_List.html#TYPEt">t</a> * 'a <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">partition xs p</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> partition [1;2;3;4] (fun x -> x mod 2 = 0) =
([2;4], [1;3])
</code></pre> </pre>
</div>
</div>
<pre><span id="VALunzip"><span class="keyword">val</span> unzip</span> : <code class="type">('a * 'b) <a href="Belt_List.html#TYPEt">t</a> -> 'a <a href="Belt_List.html#TYPEt">t</a> * 'b <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">unzip xs</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> unzip [(1,2) ; (3,4)] = ([1;3], [2;4])
</code></pre> </pre>
</div>
</div>
<pre><span id="VALgetAssocU"><span class="keyword">val</span> getAssocU</span> : <code class="type">('a * 'c) <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('a -> 'b -> bool [@bs]) -> 'c option</code></pre>
<pre><span id="VALgetAssoc"><span class="keyword">val</span> getAssoc</span> : <code class="type">('a * 'c) <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('a -> 'b -> bool) -> 'c option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">getAssoc xs k eq</code>
<p>
return the second element of a pair in <code class="code">xs</code> where the first element equals <code class="code">x</code>,
or <code class="code">None</code> if not found<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> getAssoc [ 1, "a"; 2, "b"; 3, "c"] 2 (=) = Some "b"
</code></pre> </pre>
</div>
</div>
<pre><span id="VALhasAssocU"><span class="keyword">val</span> hasAssocU</span> : <code class="type">('a * 'c) <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('a -> 'b -> bool [@bs]) -> bool</code></pre>
<pre><span id="VALhasAssoc"><span class="keyword">val</span> hasAssoc</span> : <code class="type">('a * 'c) <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('a -> 'b -> bool) -> bool</code></pre><div class="info ">
<div class="not-examples">
<code class="code">hasAssoc xs x eq</code>
return true if there is a pair in <code class="code">xs</code> where the first element equals <code class="code">x</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> hasAssoc [1, "a"; 2, "b"; 3,"c"] 1 (=) = true
</code></pre> </pre>
</div>
</div>
<pre><span id="VALremoveAssocU"><span class="keyword">val</span> removeAssocU</span> : <code class="type">('a * 'c) <a href="Belt_List.html#TYPEt">t</a> -><br> 'b -> ('a -> 'b -> bool [@bs]) -> ('a * 'c) <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALremoveAssoc"><span class="keyword">val</span> removeAssoc</span> : <code class="type">('a * 'c) <a href="Belt_List.html#TYPEt">t</a> -> 'b -> ('a -> 'b -> bool) -> ('a * 'c) <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">removeAssoc xs x eq</code>
Try to remove the first pair, if not found, leave it untouched.<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> removeAssoc [1,"a"; 2, "b"; 3, "c" ] 1 (=) =
[2, "b"; 3, "c"]
</code></pre> </pre>
</div>
</div>
<pre><span id="VALsetAssocU"><span class="keyword">val</span> setAssocU</span> : <code class="type">('a * 'c) <a href="Belt_List.html#TYPEt">t</a> -><br> 'a -> 'c -> ('a -> 'a -> bool [@bs]) -> ('a * 'c) <a href="Belt_List.html#TYPEt">t</a></code></pre>
<pre><span id="VALsetAssoc"><span class="keyword">val</span> setAssoc</span> : <code class="type">('a * 'c) <a href="Belt_List.html#TYPEt">t</a> -><br> 'a -> 'c -> ('a -> 'a -> bool) -> ('a * 'c) <a href="Belt_List.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<code class="code">setAssoc xs k v eq</code>
if <code class="code">k</code> exists in <code class="code">xs</code>, replace it with the new <code class="code">v</code>, otherwise, add
it to the head<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> setAssoc [1,"a"; 2, "b"; 3, "c"] 2 "x" (=) =
[1,"a"; 2, "x"; 3,"c"] ;;
setAssoc [1,"a"; 3, "c"] 2 "2" (=) =
[2,"2"; 1,"a"; 3, "c"]
</code></pre> </pre>
</div>
</div>
</body></html>