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Js_null_undefined.html
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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="utf-8">
<link rel="previous" href="Js_null.html">
<link rel="next" href="Js_obj.html">
<title>Js_null_undefined</title>
</head>
<body>
<nav class="module-index"><ul><li><a href="Bs.html">Bs</a></li>
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<li><a href="Dom.html">Dom</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>
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<li><a href="Js_float.html">Js_float</a></li>
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<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>
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</div>
<h1>Module <a href="type_Js_null_undefined.html">Js_null_undefined</a></h1>
<pre><span class="keyword">module</span> Js_null_undefined: <code class="code">sig</code> <a href="Js_null_undefined.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="not-examples">
Contains functionality for dealing with values that can be both <code class="code">null</code> and <code class="code">undefined</code><br>
</div>
<div class="examples">
</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 <a href="Js.html#TYPEnull_undefined">Js.null_undefined</a></code> </pre>
</div>
<div class="info ">
<div class="not-examples">
Local alias for <code class="code">'a Js.null_undefined</code><br>
</div>
<div class="examples">
</div>
</div>
<pre><span id="VALreturn"><span class="keyword">val</span> return</span> : <code class="type">'a -> 'a <a href="Js_null_undefined.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
Constructs a value of <code class="code">'a Js.null_undefined</code> containing a value of <code class="code">'a</code><br>
</div>
<div class="examples">
</div>
</div>
<pre><span id="VALtest"><span class="keyword">val</span> test</span> : <code class="type">'a <a href="Js_null_undefined.html#TYPEt">t</a> -> bool</code></pre><div class="info ">
<div class="not-examples">
Returns <code class="code">true</code> if the given value is <code class="code">null</code> or <code class="code">undefined</code>, <code class="code">false</code> otherwise<br>
</div>
<div class="examples">
</div>
</div>
<pre><span id="VALnull"><span class="keyword">val</span> null</span> : <code class="type">'a <a href="Js_null_undefined.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
The <code class="code">null</code> value of type <code class="code">'a Js.null_undefined</code><br>
</div>
<div class="examples">
</div>
</div>
<pre><span id="VALundefined"><span class="keyword">val</span> undefined</span> : <code class="type">'a <a href="Js_null_undefined.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
The <code class="code">undefined</code> value of type <code class="code">'a Js.null_undefined</code><br>
</div>
<div class="examples">
</div>
</div>
<pre><span id="VALempty"><span class="keyword">val</span> empty</span> : <code class="type">'a <a href="Js_null_undefined.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
<div class="warning">
<span class="label">
Deprecated.
</span>
Use <a href="Js_null_undefined.html#VALnull"><code class="code">Js_null_undefined.null</code></a> or <a href="Js_null_undefined.html#VALundefined"><code class="code">Js_null_undefined.undefined</code></a> instead
</div>
The empty value, <code class="code">undefined</code><br>
</div>
<div class="examples">
</div>
</div>
<pre><span id="VALbind"><span class="keyword">val</span> bind</span> : <code class="type">'a <a href="Js_null_undefined.html#TYPEt">t</a> -> ('a -> 'b [@bs]) -> 'b <a href="Js_null_undefined.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
Maps the contained value using the given function
<p>
If <code class="code">'a Js.null_undefined</code> contains a value, that value is unwrapped, mapped to a <code class="code">'b</code> using
the given function <code class="code">a' -> 'b</code>, then wrapped back up and returned as <code class="code">'b Js.null_undefined</code><br>
</div>
<div class="examples">
<pre class="example"><pre class="codepre"><code class="code">let maybeGreetWorld (maybeGreeting: string Js.null_undefined) =
Js.Undefined.bind maybeGreeting (fun greeting -> greeting ^ " world!")
</code></pre></pre>
</div>
</div>
<pre><span id="VALiter"><span class="keyword">val</span> iter</span> : <code class="type">'a <a href="Js_null_undefined.html#TYPEt">t</a> -> ('a -> unit [@bs]) -> unit</code></pre><div class="info ">
<div class="not-examples">
Iterates over the contained value with the given function
<p>
If <code class="code">'a Js.null_undefined</code> contains a value, that value is unwrapped and applied to
the given function.<br>
</div>
<div class="examples">
<pre class="example"><pre class="codepre"><code class="code">let maybeSay (maybeMessage: string Js.null_undefined) =
Js.Null_undefined.iter maybeMessage (fun message -> Js.log message)
</code></pre></pre>
</div>
</div>
<pre><span id="VALfrom_opt"><span class="keyword">val</span> from_opt</span> : <code class="type">'a option -> 'a <a href="Js_null_undefined.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
Maps <code class="code">'a option</code> to <code class="code">'a Js.null_undefined</code>
<p>
<table>
<tr> <td>Some a <td>-> <td>return a
<tr> <td>None <td>-> <td>undefined
</table>
<br>
</div>
<div class="examples">
</div>
</div>
<pre><span id="VALto_opt"><span class="keyword">val</span> to_opt</span> : <code class="type">'a <a href="Js_null_undefined.html#TYPEt">t</a> -> 'a option</code></pre><div class="info ">
<div class="not-examples">
Maps <code class="code">'a Js.null_undefined</code> to <code class="code">'a option</code>
<p>
<table>
<tr> <td>return a <td>-> <td>Some a
<tr> <td>undefined <td>-> <td>None
<tr> <td>null <td>-> <td>None
</table>
<br>
</div>
<div class="examples">
</div>
</div>
</body></html>