`Math.sign()`

Returns the sign of a number, indicating whether it is positive, negative, or zero.

Since ES2015 Spec ↗

Syntax

Math.sign(x)

Name	Type	Required	Description
`x`	`number`	Yes	The number to evaluate.

number — 1, -1, 0, -0, or NaN depending on the sign of x.

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

Output

1 -1 0

console.log(Math.sign(-0), Math.sign(NaN));

Output

-0 NaN

Returns five possible values: 1, -1, 0, -0, or NaN. Useful for branching on direction without comparing magnitudes.