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    Math.sign()

    This is a new technology, part of the ECMAScript 2015 (ES6) standard .
    This technology's specification has been finalized, but check the compatibility table for usage and implementation status in various browsers.

    Summary

    The Math.sign() function returns the sign of a number, indicating whether the number is positive, negative or zero.

    Syntax

    Math.sign(x)

    Parameters

    x
    A number.

    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).

    This function has 5 kinds of return values, 1, -1, 0, -0, NaN, which represent "positive number", "negative number", "positive zero", "negative zero" and NaN respectively.

    The argument passed to this function will be converted to x type implicitly.

    Examples

    Example: Using Math.sign()

    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
    

    Polyfill

    Math.sign = Math.sign || function(x) {
      x = +x; // convert to a number
      if (x === 0 || isNaN(x)) {
        return x;
      }
      return x > 0 ? 1 : -1;
    }
    

    Specifications

    Specification Status Comment
    ECMAScript 2015 (6th Edition, ECMA-262)
    The definition of 'Math.sign' in that specification.
    Standard Initial definition.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 38 25 (25) Not supported 25 Not supported
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support Not supported Not supported 25.0 (25) Not supported Not supported Not supported

    See also

    Document Tags and Contributors

    Last updated by: Mingun,