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The Math.abs()
function returns the absolute value of a number, that is
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 two members, 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 | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
ECMAScript 5.1 (ECMA-262) The definition of 'Math.abs' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.abs' in that specification. |
Standard | |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.abs' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
See also
Tag del documento e collaboratori
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