TheMath.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.

Try it

console.log(Math.sign(3));// Expected output: 1console.log(Math.sign(-3));// Expected output: -1console.log(Math.sign(0));// Expected output: 0console.log(Math.sign("-3"));// Expected output: -1

Syntax

Math.sign(x)

Parameters

x

A number.

Return value

A number representing the sign ofx:

• Ifx is positive, returns1.
• Ifx is negative, returns-1.
• Ifx is positive zero, returns0.
• Ifx is negative zero, returns-0.
• Otherwise, returnsNaN.

Description

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

Examples

Using Math.sign()

Math.sign(3); // 1Math.sign(-3); // -1Math.sign("-3"); // -1Math.sign(0); // 0Math.sign(-0); // -0Math.sign(NaN); // NaNMath.sign("foo"); // NaNMath.sign(); // NaN

Specifications

Browser compatibility

See also

• Polyfill ofMath.sign incore-js
• es-shims polyfill ofMath.sign
• Math.abs()
• Math.ceil()
• Math.floor()
• Math.round()
• Math.trunc()