Math.sqrt()
The Math.sqrt()
function returns the square root of a number, that is
Syntax
JavaScript
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Math.sqrt(<var>x</var>)
Parameters
x
- A number.
Return value
The square root of the given number. If the number is negative, NaN
is returned.
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
Using Math.sqrt()
JavaScript
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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 (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
ECMAScript 5.1 (ECMA-262) The definition of 'Math.sqrt' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.sqrt' in that specification. |
Standard | |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.sqrt' 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
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/math/sqrt