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Math.sign()

The Math.sign() function returns either a positive or negative +/- 1, indicating the sign of a number passed into the argument. If the number passed into Math.sign() is 0, it will return a +/- 0. Note that if the number is positive, an explicit (+) will not be returned.

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Syntax

Math.sign(x)

Parameters

x: A number. If this argument is not a number, it is implicitly converted to one.

Return value

A number representing the sign of the given argument:

If the argument is positive, returns 1.
If the argument is negative, returns -1.
If the argument is positive zero, returns 0.
If the argument is negative zero, returns -0.
Otherwise, NaN is returned.

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()

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	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	Deno	Node.js
`sign`	38	12	25	No	25	9	38	38	25	25	9	3.0	1.0	0.12.0