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    Math.sqrt Redirect 1

    Summary

    The Math.sqrt() function returns the square root of a number, that is

    x0,Math.sqrt(x)=x=the uniquey0such thaty2=x\forall x \geq 0, \mathtt{Math.sqrt(x)} = \sqrt{x} = \text{the unique} \; y \geq 0 \; \text{such that} \; y^2 = x

    Syntax

    Math.sqrt(x) 

    Parameters

    x
    A number.

    Description

    If the value of number is negative, sqrt returns NaN.

    Because sqrt is a static method of Math, you always use it as Math.sqrt(), rather than as a method of a Math object you created.

    Examples

    Example: Using Math.sqrt

    Math.sqrt(9); // 3
    Math.sqrt(2); // 1.414213562373095
    
    Math.sqrt(1);  // 1
    Math.sqrt(0);  // 0
    Math.sqrt(-1); // NaN

    Specifications

    Specification Status Comment
    ECMAScript 1st Edition. Implemented in JavaScript 1.0 Standard Initial definition.
    ECMAScript Language Specification 5.1th Edition (ECMA-262) Standard  
    ECMAScript Language Specification 6th Edition (ECMA-262) 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)

     

    Document Tags and Contributors

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