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, returns1
. - If
x
is negative, returns-1
. - If
x
is positive zero, returns0
. - 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
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