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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>
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<script>hljs.initHighlightingOnLoad();</script>
<meta charset="utf8">
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<title> Belt_Option </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_Debug.html">Belt_Debug</a></li>
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<li><a href="Belt_HashMap.html">Belt_HashMap</a></li>
<li><a href="Belt_HashMapInt.html">Belt_HashMapInt</a></li>
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<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>
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<li><a href="Belt_SetString.html">Belt_SetString</a></li>
<li><a href="Belt_SortArray.html">Belt_SortArray</a></li>
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<li><a href="Belt_SortArrayString.html">Belt_SortArrayString</a></li>
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</div>
<h1>Module <a href="type_Belt_Option.html">Belt_Option</a></h1>
<pre><span id="MODULEBelt_Option"><span class="keyword">module</span> Belt_Option</span>: <code class="code">sig</code> <a href="Belt_Option.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="not-examples">
<a href="Belt.Option.html"><code class="code">Belt.Option</code></a>
Utilities for option data type<br>
</div>
</div>
<hr width="100%">
<pre><span id="VALforEachU"><span class="keyword">val</span> forEachU</span> : <code class="type">'a option -> ('a -> unit [@bs]) -> unit</code></pre><div class="info ">
<div class="not-examples">
Uncurried version of <code class="code">forEach</code><br>
</div>
</div>
<pre><span id="VALforEach"><span class="keyword">val</span> forEach</span> : <code class="type">'a option -> ('a -> unit) -> unit</code></pre><div class="info ">
<div class="not-examples">
<code class="code">forEach optionValue f</code>
If <code class="code">optionValue</code> is <code class="code">Some value</code>, it calls <code class="code">f value</code>; otherwise returns <code class="code">()</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> forEach (Some "thing")(fun x -> Js.log x);; (* logs "thing" *)
forEach None (fun x -> Js.log x);; (* returns () *)
</code></pre> </pre>
</div>
</div>
<pre><span id="VALgetExn"><span class="keyword">val</span> getExn</span> : <code class="type">'a option -> 'a</code></pre><div class="info ">
<div class="not-examples">
<code class="code">getExn optionalValue</code>
Returns <code class="code">value</code> if <code class="code">optionalValue</code> is <code class="code">Some value</code>, otherwise raises <code class="code">getExn</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> getExn (Some 3) = 3;;
getExn None (* Raises getExn error *)
</code></pre> </pre>
</div>
</div>
<pre><span id="VALmapWithDefaultU"><span class="keyword">val</span> mapWithDefaultU</span> : <code class="type">'a option -> 'b -> ('a -> 'b [@bs]) -> 'b</code></pre><div class="info ">
<div class="not-examples">
Uncurried version of <code class="code">mapWithDefault</code><br>
</div>
</div>
<pre><span id="VALmapWithDefault"><span class="keyword">val</span> mapWithDefault</span> : <code class="type">'a option -> 'b -> ('a -> 'b) -> 'b</code></pre><div class="info ">
<div class="not-examples">
<code class="code">mapWithDefault optionValue default f</code>
If <code class="code">optionValue</code> is <code class="code">Some value</code>, returns <code class="code">f value</code>; otherwise returns <code class="code">default</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> mapWithDefault (Some 3) 0 (fun x -> x + 5) = 8;;
mapWithDefault None 0 (fun x -> x + 5) = 0;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALmapU"><span class="keyword">val</span> mapU</span> : <code class="type">'a option -> ('a -> 'b [@bs]) -> 'b option</code></pre><div class="info ">
<div class="not-examples">
Uncurried version of <code class="code">map</code><br>
</div>
</div>
<pre><span id="VALmap"><span class="keyword">val</span> map</span> : <code class="type">'a option -> ('a -> 'b) -> 'b option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">map optionValue f</code>
If <code class="code">optionValue</code> is <code class="code">Some value</code>, returns <code class="code">Some (f value)</code>; otherwise returns <code class="code">None</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> map (Some 3) (fun x -> x * x) = (Some 9);;
map None (fun x -> x * x) = None;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALflatMapU"><span class="keyword">val</span> flatMapU</span> : <code class="type">'a option -> ('a -> 'b option [@bs]) -> 'b option</code></pre><div class="info ">
<div class="not-examples">
Uncurried version of <code class="code">flatMap</code><br>
</div>
</div>
<pre><span id="VALflatMap"><span class="keyword">val</span> flatMap</span> : <code class="type">'a option -> ('a -> 'b option) -> 'b option</code></pre><div class="info ">
<div class="not-examples">
<code class="code">flatMap optionValue f</code>
If <code class="code">optionValue</code> is <code class="code">Some value</code>, returns <code class="code">f value</code>; otherwise returns <code class="code">None</code>
The function <code class="code">f</code> must have a return type of <code class="code">'a option</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> let f (x : float) =
if x >= 0.0 then
Some (sqrt x)
else
None;;
flatMap (Some 4.0) f = Some 2.0;;
flatMap (Some (-4.0)) f = None;;
flatMap None f = None;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALgetWithDefault"><span class="keyword">val</span> getWithDefault</span> : <code class="type">'a option -> 'a -> 'a</code></pre><div class="info ">
<div class="not-examples">
<code class="code">getWithDefault optionalValue default</code>
If <code class="code">optionalValue</code> is <code class="code">Some value</code>, returns <code class="code">value</code>, otherwise <code class="code">default</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> getWithDefault (Some 1812) 1066 = 1812;;
getWithDefault None 1066 = 1066;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALisSome"><span class="keyword">val</span> isSome</span> : <code class="type">'a option -> bool</code></pre><div class="info ">
<div class="not-examples">
Returns <code class="code">true</code> if the argument is <code class="code">Some value</code>, <code class="code">false</code> otherwise<br>
</div>
</div>
<pre><span id="VALisNone"><span class="keyword">val</span> isNone</span> : <code class="type">'a option -> bool</code></pre><div class="info ">
<div class="not-examples">
Returns <code class="code">true</code> if the argument is <code class="code">None</code>, <code class="code">false</code> otherwise<br>
</div>
</div>
<pre><span id="VALeqU"><span class="keyword">val</span> eqU</span> : <code class="type">'a option -> 'b option -> ('a -> 'b -> bool [@bs]) -> bool</code></pre><div class="info ">
<div class="not-examples">
Uncurried version of <code class="code">eq</code><br>
</div>
</div>
<pre><span id="VALeq"><span class="keyword">val</span> eq</span> : <code class="type">'a option -> 'b option -> ('a -> 'b -> bool) -> bool</code></pre><div class="info ">
<div class="not-examples">
<code class="code">eq optValue1 optvalue2 predicate</code>
Evaluates two optional values for equality with respect to a predicate function.
If both <code class="code">optValue1</code> and <code class="code">optValue2</code> are <code class="code">None</code>, returns <code class="code">true</code>.
If one of the arguments is <code class="code">Some value</code> and the other is <code class="code">None</code>, returns <code class="code">false</code>
If arguments are <code class="code">Some value1</code> and <code class="code">Some value2</code>, returns the result of <code class="code">predicate value1 value2</code>;
the <code class="code">predicate</code> function must return a <code class="code">bool</code><br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> let clockEqual = (fun a b -> a mod 12 = b mod 12);;
eq (Some 3) (Some 15) clockEqual = true;;
eq (Some 3) None clockEqual = false;;
eq None (Some 3) clockEqual = false;;
eq None None clockEqual = true;;
</code></pre> </pre>
</div>
</div>
<pre><span id="VALcmpU"><span class="keyword">val</span> cmpU</span> : <code class="type">'a option -> 'b option -> ('a -> 'b -> int [@bs]) -> int</code></pre><div class="info ">
<div class="not-examples">
Uncurried version of <code class="code">cmp</code><br>
</div>
</div>
<pre><span id="VALcmp"><span class="keyword">val</span> cmp</span> : <code class="type">'a option -> 'b option -> ('a -> 'b -> int) -> int</code></pre><div class="info ">
<div class="not-examples">
<code class="code">cmp optValue1 optvalue2 comparisonFcn</code>
Compares two optional values with respect to a comparison function
If both <code class="code">optValue1</code> and <code class="code">optValue2</code> are <code class="code">None</code>, returns 0.
If the first argument is <code class="code">Some value1</code> and the second is <code class="code">None</code>, returns 1 (something is greater than nothing)
If the first argument is <code class="code">None</code> and the second is <code class="code">Some value2</code>, returns -1 (nothing is less than something)
If the arguments are <code class="code">Some value1</code> and <code class="code">Some value2</code>, returns the result of <code class="code">comparisonFcn value1 value2</code>; <code class="code">comparisonFcn</code> takes two arguments and returns -1 if the first argument is less than the second, 0 if the arguments are equal, and 1 if the first argument is greater than the second.<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code"> let clockCompare = fun a b -> compare (a mod 12) (b mod 12);;
cmp (Some 3) (Some 15) clockCompare = 0;;
cmp (Some 3) (Some 14) clockCompare = 1;;
cmp (Some 2) (Some 15) clockCompare = -1;;
cmp None (Some 15) clockCompare = -1;;
cmp (Some 14) None clockCompare = 1;;
cmp None None clockCompare = 0;;
</code></pre> </pre>
</div>
</div>
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