Find the Square Root in JavaScript.

This tutorial explains how to find the square root of a number in JavaScript. In JavaScript, we can use the in-built Math.sqrt() function to find the square root of a number.

Syntax

The syntax for sqrt() function in JavaScript is:

Math.sqrt(number);

Here, number must be greater than or equal to 0. If the number is a negative number, the sqrt() function will return NaN.

Example

Let’s see an example on how to use the sqrt() function in JavaScript.

console.log(Math.sqrt(25));
console.log(Math.sqrt(5));
console.log(Math.sqrt(-9));

Output

5
2.2360679774997896
NaN