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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:43:23 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:43:23 -0500
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+---
+title: Math.sign()
+slug: Web/JavaScript/Reference/Global_Objects/Math/sign
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/sign
+---
+<div>{{JSRef}}</div>
+
+<div><code><strong>Math.sign()</strong></code> fonksiyonu, parametre olarak aldığı sayının negatif (-1) veya pozitif (1) olduğu bilgisini döndürür. Parametre olarak 0 gönderilirse, +/- 0 döndürür. Sayı pozitifse ayrıca + işareti döndürülmez.</div>
+
+<div></div>
+
+<div>{{EmbedInteractiveExample("pages/js/math-sign.html")}}</div>
+
+<div class="hidden">The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone <a href="https://github.com/mdn/interactive-examples">https://github.com/mdn/interactive-examples</a> and send us a pull request.</div>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox">Math.sign(<var>x</var>)</pre>
+
+<h3 id="Parameters">Parameters</h3>
+
+<dl>
+ <dt><code><var>x</var></code></dt>
+ <dd>A number. If this argument is not a <code>number</code>, it is implicitly converted to one.</dd>
+</dl>
+
+<h3 id="Return_value">Return value</h3>
+
+<p>A number representing the sign of the given argument:</p>
+
+<ul>
+ <li>If the argument is positive, returns <code>1</code>.</li>
+ <li>If the argument is negative, returns <code>-1</code>.</li>
+ <li>If the argument is positive zero, returns <code>0</code>.</li>
+ <li>If the argument is negative zero, returns <code>-0</code>.</li>
+ <li>Otherwise, {{jsxref("NaN")}} is returned.</li>
+</ul>
+
+<h2 id="Description">Description</h2>
+
+<p>Because <code>sign()</code> is a static method of <code>Math</code>, you always use it as <code>Math.sign()</code>, rather than as a method of a <code>Math</code> object you created (<code>Math</code> is not a constructor).</p>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<pre class="brush: js">if (!Math.sign) {
+ Math.sign = function(x) {
+ // If x is NaN, the result is NaN.
+ // If x is -0, the result is -0.
+ // If x is +0, the result is +0.
+ // If x is negative and not -0, the result is -1.
+ // If x is positive and not +0, the result is +1.
+ return ((x &gt; 0) - (x &lt; 0)) || +x;
+ // A more aesthetic pseudo-representation:
+  //
+  // ( (x &gt; 0) ? 1 : 0 ) // if x is positive, then positive one
+  // + // else (because you can't be both - and +)
+  // ( (x &lt; 0) ? -1 : 0 ) // if x is negative, then negative one
+  // || // if x is 0, -0, or NaN, or not a number,
+  // +x // then the result will be x, (or) if x is
+  // // not a number, then x converts to number
+ };
+}
+</pre>
+
+<p>In the above polyfill, no extra type-coercing is needed to make <code>(x &gt; 0)</code> or <code>(x &lt; 0)</code> numbers because subtracting them from each other forces a type conversion from booleans to numbers.</p>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Using_Math.sign">Using <code>Math.sign()</code></h3>
+
+<pre class="brush: js">Math.sign(3); // 1
+Math.sign(-3); // -1
+Math.sign('-3'); // -1
+Math.sign(0); // 0
+Math.sign(-0); // -0
+Math.sign(NaN); // NaN
+Math.sign('foo'); // NaN
+Math.sign(); // NaN
+</pre>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+ <tr>
+ <th scope="col">Specification</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>{{SpecName('ESDraft', '#sec-math.sign', 'Math.sign')}}</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<div class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a class="external" href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</div>
+
+<p>{{Compat("javascript.builtins.Math.sign")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{jsxref("Math.abs()")}}</li>
+ <li>{{jsxref("Math.ceil()")}}</li>
+ <li>{{jsxref("Math.floor()")}}</li>
+ <li>{{jsxref("Math.round()")}}</li>
+ <li>{{jsxref("Math.trunc()")}}</li>
+</ul>