To get the square root of a number in JavaScript ECMAScript 2021, you can use the Math.sqrt() method. This method takes a single argument, which is the number you want to find the square root of.
Here are some examples:
Example 1:
// Find the square root of 9.
const num = 9;
const squareRoot = Math.sqrt(num);
console.log(squareRoot); // Output: 3
Example 2:
// Find the square root of 25.
const num = 25;
const squareRoot = Math.sqrt(num);
console.log(squareRoot); // Output: 5
Example 3:
// Find the square root of a variable.
let num = 16;
const squareRoot = Math.sqrt(num);
console.log(squareRoot); // Output: 4
// Change the value of the variable.
num = 36;
console.log(Math.sqrt(num)); // Output: 6
Note that the Math.sqrt() method only works with positive numbers. If you pass a negative number to this method, it will return NaN (Not a Number).