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Math.sign()

The Math.sign() static method returns 1 or -1, indicating the sign of the number passed as argument. If the input is 0 or -0, it will be returned as-is.

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Syntax

js
Math.sign(x)

Parameters

x

A number.

Return value

A number representing the sign of x:

  • If x is positive, returns 1.
  • If x is negative, returns -1.
  • If x is positive zero, returns 0.
  • If x is negative zero, returns -0.
  • Otherwise, returns NaN.

Description

Because sign() is a static method of Math, you always use it as Math.sign(), rather than as a method of a Math object you created (Math is not a constructor).

Examples

Using Math.sign()

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

Specifications

Specification
ECMAScript Language Specification
# sec-math.sign

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android Deno Node.js
sign 38 12 25 25 9 38 25 25 9 3.0 38 1.0 0.12.0

See also

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/sign