Math.abs()
The Math.abs()
function returns
the absolute value of a number. That is, it returns x
if x
is positive or zero, and the negation of x
if x
is negative.
Syntax
Math.abs(x)
Parameters
x
-
A number.
Return value
The absolute value of the given number.
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
Behavior of Math.abs()
Passing an empty object, an array with more than one member, a non-numeric string or
undefined
/empty variable returns NaN
. Passing
null
, an empty string or an empty array returns 0.
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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