Try it

function getRoot1Over2() {
  return Math.SQRT1_2;
}

console.log(getRoot1Over2());
// Expected output: 0.7071067811865476

Value

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:

function getSquareSideLength(diagonalLength) {
  return diagonalLength * Math.SQRT1_2;
}

Specifications

Browser compatibility

See also

• Math.pow()
• Math.sqrt()