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<!doctype html>
<html>
<head>
<link rel="stylesheet" href="../api_static/tomorrow-night.css">
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<meta charset="utf8">
<link rel="previous" href="Js_exn.html"><link rel="next" href="Js_global.html">
<title> Js_float </title></head>
<body>
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</div>
<h1>Module <a href="type_Js_float.html">Js_float</a></h1>
<pre><span class="keyword">module</span> Js_float: <code class="code">sig</code> <a href="Js_float.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="not-examples">
Provides functions for inspecting and manipulating <code class="code">float</code>s<br>
</div>
</div>
<hr width="100%">
<pre><span id="VAL_NaN"><span class="keyword">val</span> _NaN</span> : <code class="type">float</code></pre><div class="info ">
<div class="not-examples">
The special value "Not a Number"<br>
<div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN">MDN</a><br>
</div>
</div>
</div>
<pre><span id="VALisNaN"><span class="keyword">val</span> isNaN</span> : <code class="type">float -> bool</code></pre><div class="info ">
<div class="not-examples">
Tests if the given value is <code class="code">_NaN</code>
<p>
Note that both <code class="code">_NaN = _NaN</code> and <code class="code">_NaN == _NaN</code> will return <code class="code">false</code>. <code class="code">isNaN</code> is
therefore necessary to test for <code class="code">_NaN</code>.
<p>
<b>Returns</b> <code class="code">true</code> if the given value is <code class="code">_NaN</code>, <code class="code">false</code> otherwise<br>
<div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN">MDN</a><br>
</div>
</div>
</div>
<pre><span id="VALisFinite"><span class="keyword">val</span> isFinite</span> : <code class="type">float -> bool</code></pre><div class="info ">
<div class="not-examples">
Tests if the given value is finite
<p>
<b>Returns</b> <code class="code">true</code> if the given value is a finite number, <code class="code">false</code> otherwise<br>
<div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* returns [false] *)
let _ = Js.Float.isFinite infinity
(* returns [false] *)
let _ = Js.Float.isFinite neg_infinity
(* returns [false] *)
let _ = Js.Float.isFinite _NaN
(* returns [true] *)
let _ = Js.Float.isFinite 1234
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoExponential"><span class="keyword">val</span> toExponential</span> : <code class="type">float -> string</code></pre><div class="info ">
<div class="not-examples">
Formats a <code class="code">float</code> using exponential (scientific) notation
<p>
<b>Returns</b> a <code class="code">string</code> representing the given value in exponential notation<br>
<div class="tag"> <b>Raises</b> <code>RangeError</code> if digits is not in the range [0, 20] (inclusive)<br>
</div><div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toExponential">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints "7.71234e+1" *)
let _ = Js.log @@ Js.Float.toExponential 77.1234
(* prints "7.7e+1" *)
let _ = Js.log @@ Js.Float.toExponential 77.
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoExponentialWithPrecision"><span class="keyword">val</span> toExponentialWithPrecision</span> : <code class="type">float -> digits:int -> string</code></pre><div class="info ">
<div class="not-examples">
Formats a <code class="code">float</code> using exponential (scientific) notation
<p>
<b>digits</b> specifies how many digits should appear after the decimal point. The
value must be in the range [0, 20] (inclusive).
<p>
<b>Returns</b> a <code class="code">string</code> representing the given value in exponential notation
<p>
The output will be rounded or padded with zeroes if necessary.<br>
<div class="tag"> <b>Raises</b> <code>RangeError</code> if digits is not in the range [0, 20] (inclusive)<br>
</div><div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toExponential">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints "7.71e+1" *)
let _ = Js.log @@ Js.Float.toExponentialWithPrecision 77.1234 ~digits:2
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoFixed"><span class="keyword">val</span> toFixed</span> : <code class="type">float -> string</code></pre><div class="info ">
<div class="not-examples">
Formats a <code class="code">float</code> using fixed point notation
<p>
<b>Returns</b> a <code class="code">string</code> representing the given value in fixed-point notation (usually)<br>
<div class="tag"> <b>Raises</b> <code>RangeError</code> if digits is not in the range [0, 20] (inclusive)<br>
</div><div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints "12346" (note the rounding) *)
let _ = Js.log @@ Js.Float.toFixed 12345.6789
(* print "1.2e+21" *)
let _ = Js.log @@ Js.Float.toFixed 1.2e21
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoFixedWithPrecision"><span class="keyword">val</span> toFixedWithPrecision</span> : <code class="type">float -> digits:int -> string</code></pre><div class="info ">
<div class="not-examples">
Formats a <code class="code">float</code> using fixed point notation
<p>
<b>digits</b> specifies how many digits should appear after the decimal point. The
value must be in the range [0, 20] (inclusive). Defaults to <code class="code">0</code>.
<p>
<b>Returns</b> a <code class="code">string</code> representing the given value in fixed-point notation (usually)
<p>
The output will be rounded or padded with zeroes if necessary.<br>
<div class="tag"> <b>Raises</b> <code>RangeError</code> if digits is not in the range [0, 20] (inclusive)<br>
</div><div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints "12345.7" (note the rounding) *)
let _ = Js.log @@ Js.Float.toFixedWithPrecision 12345.6789 ~digits:1
(* prints "0.00" (note the added zeroes) *)
let _ = Js.log @@ Js.Float.toFixedWithPrecision 0. ~digits:2
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoPrecision"><span class="keyword">val</span> toPrecision</span> : <code class="type">float -> string</code></pre><div class="info ">
<div class="not-examples">
Formats a <code class="code">float</code> using some fairly arbitrary rules
<p>
<b>Returns</b> a <code class="code">string</code> representing the given value in fixed-point (usually)
<p>
<code class="code">toPrecision</code> differs from <code class="code">toFixed</code> in that the former will format the number
with full precision, while the latter will not output any digits after the
decimal point.<br>
<div class="tag"> <b>Raises</b> <code>RangeError</code> if digits is not in the range accepted by this function (what do you mean "vague"?)<br>
</div><div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toPrecision">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints "12345.6789" *)
let _ = Js.log @@ Js.Float.toPrecision 12345.6789
(* print "1.2e+21" *)
let _ = Js.log @@ Js.Float.toPrecision 1.2e21
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoPrecisionWithPrecision"><span class="keyword">val</span> toPrecisionWithPrecision</span> : <code class="type">float -> digits:int -> string</code></pre><div class="info ">
<div class="not-examples">
Formats a <code class="code">float</code> using some fairly arbitrary rules
<p>
<b>digits</b> specifies how many digits should appear in total. The
value must between 0 and some arbitrary number that's hopefully at least larger
than 20 (for Node it's 21. Why? Who knows).
<p>
<b>Returns</b> a <code class="code">string</code> representing the given value in fixed-point or scientific notation
<p>
The output will be rounded or padded with zeroes if necessary.
<p>
<code class="code">toPrecisionWithPrecision</code> differs from <code class="code">toFixedWithPrecision</code> in that the former
will count all digits against the precision, while the latter will count only
the digits after the decimal point. <code class="code">toPrecisionWithPrecision</code> will also use
scientific notation if the specified precision is less than the number for digits
before the decimal point.<br>
<div class="tag"> <b>Raises</b> <code>RangeError</code> if digits is not in the range accepted by this function (what do you mean "vague"?)<br>
</div><div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toPrecision">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints "1e+4" *)
let _ = Js.log @@ Js.Float.toPrecisionWithPrecision 12345.6789 ~digits:1
(* prints "0.0" *)
let _ = Js.log @@ Js.Float.toPrecisionWithPrecision 0. ~digits:2
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoString"><span class="keyword">val</span> toString</span> : <code class="type">float -> string</code></pre><div class="info ">
<div class="not-examples">
Formats a <code class="code">float</code> as a string
<p>
<b>Returns</b> a <code class="code">string</code> representing the given value in fixed-point (usually)<br>
<div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toString">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints "12345.6789" *)
let _ = Js.log @@ Js.Float.toString 12345.6789
</code></pre> </pre>
</div>
</div>
<pre><span id="VALtoStringWithRadix"><span class="keyword">val</span> toStringWithRadix</span> : <code class="type">float -> radix:int -> string</code></pre><div class="info ">
<div class="not-examples">
Formats a <code class="code">float</code> as a string
<p>
<b>radix</b> specifies the radix base to use for the formatted number. The
value must be in the range [2, 36] (inclusive).
<p>
<b>Returns</b> a <code class="code">string</code> representing the given value in fixed-point (usually)<br>
<div class="tag"> <b>Raises</b> <code>RangeError</code> if radix is not in the range [2, 36] (inclusive)<br>
</div><div class="tag"> <b>See also</b> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toString">MDN</a><br>
</div>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* prints "110" *)
let _ = Js.log @@ Js.Float.toStringWithRadix 6. ~radix:2
(* prints "11.001000111101011100001010001111010111000010100011111" *)
let _ = Js.log @@ Js.Float.toStringWithRadix 3.14 ~radix:2
(* prints "deadbeef" *)
let _ = Js.log @@ Js.Float.toStringWithRadix 3735928559. ~radix:16
(* prints "3f.gez4w97ry0a18ymf6qadcxr" *)
let _ = Js.log @@ Js.Float.toStringWithRadix 123.456 ~radix:36
</code></pre> </pre>
</div>
</div>
<pre><span id="VALfromString"><span class="keyword">val</span> fromString</span> : <code class="type">string -> float</code></pre><div class="info ">
<div class="not-examples">
Parses the given <code class="code">string</code> into a <code class="code">float</code> using JavaScript semantics
<p>
<b>Returns</b> the number as a <code class="code">float</code> if successfully parsed, <code class="code">_NaN</code> otherwise.<br>
</div>
<div class="examples">
<pre class="example"> <pre class="codepre"><code class="code">(* returns 123 *)
let _ = Js.Float.fromString "123"
(* returns 12.3 *)
let _ = Js.Float.fromString "12.3"
(* returns 0 *)
let _ = Js.Float.fromString ""
(* returns 17 *)
let _ = Js.Float.fromString "0x11"
(* returns 3 *)
let _ = Js.Float.fromString "0b11"
(* returns 9 *)
let _ = Js.Float.fromString "0o11"
(* returns [_NaN] *)
let _ = Js.Float.fromString "foo"
(* returns [_NaN] *)
let _ = Js.Float.fromString "100a"
</code></pre> </pre>
</div>
</div>
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