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Js_null.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="utf8">
<link rel="previous" href="Js_nativeint.html"><link rel="next" href="Js_null_undefined.html">
<title> Js_null </title></head>
<body>
<nav class="module-index"><ul><li><a href="Bs.html">Bs</a></li>
<li><a href="Bs_dyn.html">Bs_dyn</a></li>
<li><a href="Bs_dyn_lib.html">Bs_dyn_lib</a></li>
<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>
<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_json.html">Js_json</a></li>
<li><a href="Js_list.html">Js_list</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="Js_nativeint.html" title="Js_nativeint">Previous</a>
<a class="up" href="index.html" title="Index">Up</a>
<a class="post" href="Js_null_undefined.html" title="Js_null_undefined">Next</a>
</div>
<h1>Module <a href="type_Js_null.html">Js_null</a></h1>
<pre><span class="keyword">module</span> Js_null: <code class="code">sig</code> <a href="Js_null.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="not-examples">
Provides functionality for dealing with the <code class="code">'a Js.null</code> type<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 <a href="Js.html#TYPEnull">Js.null</a></code> </pre>
</div>
<div class="info ">
<div class="not-examples">
Local alias for <code class="code">'a Js.null</code><br>
</div>
</div>
<pre><span id="VALreturn"><span class="keyword">val</span> return</span> : <code class="type">'a -> 'a <a href="Js_null.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
Constructs a value of <code class="code">'a Js.null</code> containing a value of <code class="code">'a</code><br>
</div>
</div>
<pre><span id="VALtest"><span class="keyword">val</span> test</span> : <code class="type">'a <a href="Js_null.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">empty</code> (<code class="code">null</code>), <code class="code">false</code> otherwise<br>
</div>
</div>
<pre><span id="VALempty"><span class="keyword">val</span> empty</span> : <code class="type">'a <a href="Js_null.html#TYPEt">t</a></code></pre><div class="info ">
<div class="not-examples">
The empty value, <code class="code">null</code><br>
</div>
</div>
<pre><span id="VALbind"><span class="keyword">val</span> bind</span> : <code class="type">'a <a href="Js_null.html#TYPEt">t</a> -> ('a -> 'b [@bs]) -> 'b <a href="Js_null.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</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</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">let maybeGreetWorld (maybeGreeting: string Js.null) =
Js.Null.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.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</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) =
Js.Null.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.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</code>
<p>
<table>
<tr> <td>Some a <td>-> <td>return a
<tr> <td>None <td>-> <td>empty
</table>
<br>
</div>
</div>
<pre><span id="VALto_opt"><span class="keyword">val</span> to_opt</span> : <code class="type">'a <a href="Js_null.html#TYPEt">t</a> -> 'a option</code></pre><div class="info ">
<div class="not-examples">
Maps <code class="code">'a Js.null</code> to <code class="code">'a option</code>
<p>
<table>
<tr> <td>return a <td>-> <td>Some a
<tr> <td>empty <td>-> <td>None
</table>
<br>
</div>
</div>
</body></html>