In this example, you will learn to write a program to find square root in javascript.

But before going into the example, you must have knowledge of the following JavaScript topics:

To find the square root of a number in javascript, we can use the `Math.sqrt()`

method of javascript. Its syntax is:

`Math.sqrt(number);`

Here, `Math.sqrt()`

takes in the number and returns its square root.

**Example 1:** Find the Square Root of a Number

```
let num = 4;
// finding the square root
let root = Math.sqrt(num);
console.log(`Square root of ${num} is: ${root}`);
```

**Output**

Square root of 4 is: 2

**Example 2:** Find the Square Root of the User Input Number

```
// user input number
let num = prompt('Enter the number: ');
// finding square root
let root = Math.sqrt(num);
console.log(`Square root of ${num} is: ${root}`);
```

**Output**

Enter the number: 4

Square root of 4 is: 2

**Example 3:** Square Root of Different Data Types

```
let num1 = 4.8;
let num2 = 'Hello';
let num3 = '-4';
// finding square root
let root1 = Math.sqrt(num1);
let root2 = Math.sqrt(num2);
let root3 = Math.sqrt(num3);
console.log(`Square root of ${num1} is: ${root1}`);
console.log(`Square root of ${num2} is: ${root2}`);
console.log(`Square root of ${num3} is: ${root3}`);
```

**Output**

Square root of 4.8 is: 2.1908902300206643

Square root of Hello is: NaN

Square root of -4 is: NaN

If 0 or a positive value is passed, `Math.sqrt()`

method will return the square root of that value

If a string is passed, `NaN`

is returned

If a negative value is passed, `NaN`

is returned.