JavaScript (ES2026) reference · Math Methods and Constants

JavaScript Math.sign() Method

Return 1, -1 or 0 depending on whether a number is positive, negative or zero.

JavaScript (ES2026) Since ES2015

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Syntax

Math.sign(x)

Parameter	Description
`x`	A number.

1, -1, 0, -0 or NaN.

Positive, negative, zeroTry it yourself

console.log(Math.sign(12), Math.sign(-3), Math.sign(0));

Output

1 -1 0

Pick a label from the signTry it yourself

const change = -4.2;
console.log(["down", "flat", "up"][Math.sign(change) + 1]);

Output

down

Version	Change
JavaScript ES2015	Added

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