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    Math.sqrt()

    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 x is negative, Math.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 (Math is not a constructor).

    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. Standard Initial definition. Implemented in JavaScript 1.0.
    ECMAScript 5.1 (ECMA-262)
    The definition of 'Math.sqrt' in that specification.
    Standard  
    ECMAScript 6 (ECMA-262)
    The definition of 'Math.sqrt' in that specification.
    Release Candidate  

    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

    Last updated by: Mingun,