Math.abs()
The Math.abs()
static method returns the absolute value of a number.
Try it
Syntax
js
Math.abs(x)
Parameters
x
-
A number.
Return value
The absolute value of x
. If x
is negative (including -0
), returns -x
. Otherwise, returns x
. The result is therefore always a positive number or 0
.
Description
Because abs()
is a static method of Math
, you always use it as Math.abs()
, rather than as a method of a Math
object you created (Math
is not a constructor).
Examples
Using Math.abs()
js
Math.abs(-Infinity); // Infinity
Math.abs(-1); // 1
Math.abs(-0); // 0
Math.abs(0); // 0
Math.abs(1); // 1
Math.abs(Infinity); // Infinity
Coercion of parameter
Math.abs()
coerces its parameter to a number. Non-coercible values will become NaN
, making Math.abs()
also return NaN
.
js
Math.abs("-1"); // 1
Math.abs(-2); // 2
Math.abs(null); // 0
Math.abs(""); // 0
Math.abs([]); // 0
Math.abs([2]); // 2
Math.abs([1, 2]); // NaN
Math.abs({}); // NaN
Math.abs("string"); // NaN
Math.abs(); // NaN
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.abs |
Browser compatibility
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