Math.SQRT1_2
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The Math.SQRT1_2 static data property represents the square root of 1/2, which is approximately 0.707.
Try it
function getRoot1Over2() {
return Math.SQRT1_2;
}
console.log(getRoot1Over2());
// Expected output: 0.7071067811865476
Value
Property attributes of Math.SQRT1_2 | |
|---|---|
| Writable | no |
| Enumerable | no |
| Configurable | no |
Description
Math.SQRT1_2 is a constant and a more performant equivalent to Math.sqrt(0.5).
Because SQRT1_2 is a static property of Math, you always use it as Math.SQRT1_2, rather than as a property of a Math object you created (Math is not a constructor).
Examples
Using Math.SQRT1_2
The following function calculates the side length of a square given its diagonal length:
js
function getSquareSideLength(diagonalLength) {
return diagonalLength * Math.SQRT1_2;
}
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-math.sqrt1_2 |
Browser compatibility
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SQRT1_2
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Legend
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