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    abs

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    Summary

    The Math.abs(x) function returns the absolute value of a number "x".

    Syntax

    var abs = Math.abs(x);

    Parameters

    x
    A number.

    Description

    Because abs is a static method of Math, you always use it as Math.abs().

    Examples

    Example: Behaviour of Math.abs()

    Passing a non-numeric string or undefined/empty variable returns NaN. Passing null returns 0.

    Math.abs('-1');     // 1
    Math.abs(-2);       // 2
    Math.abs(null);     // 0
    Math.abs("string"); // NaN
    Math.abs();         // NaN

    Specifications

    Specification Status Comment
    ECMAScript 1st Edition. Implemented in JavaScript 1.0 Standard Initial definition.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Math.abs' in that specification.
    Standard  
    ECMAScript 6 (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

    Document Tags and Contributors

    Contributors to this page: ethertank
    Last updated by: ethertank,