# CoffeeScript Math - sqrt()

## Description

The sqrt() method accepts a number and returns its square root value. If the value of a number is negative, sqrt returns NaN.

## Syntax

Given below is the syntax of sqrt() method of JavaScript. We can use the same method in the CoffeeScript code.

```Math.sqrt ( x )
```

## Example

The following example demonstrates the usage of the sqrt() method in CoffeeScript. Save this code in a file with name math_sqrt.coffee.

```value = Math.sqrt 0.5
console.log "The square root of 0.5 is : " + value

value = Math.sqrt 81
console.log "The square root of 81 is : " + value

value = Math.sqrt 13
console.log "The square root of 13 is : " + value

value = Math.sqrt -4
console.log "The square root of -4 is : " + value
```

Open the command prompt and compile the .coffee file as shown below.

```c:\> coffee -c math_sqrt.coffee
```

On compiling, it gives you the following JavaScript.

```// Generated by CoffeeScript 1.10.0
(function() {
var value;

value = Math.sqrt(0.5);

console.log("The square root of 0.5 is : " + value);

value = Math.sqrt(81);

console.log("The square root of 81 is : " + value);

value = Math.sqrt(13);

console.log("The square root of 13 is : " + value);

value = Math.sqrt(-4);

console.log("The square root of -4 is : " + value);

}).call(this);
```

Now, open the command prompt again, and run the CoffeeScript file as shown below.

```c:\> coffee math_sqrt.coffee
```

On executing, the CoffeeScript file produces the following output.

```The square root of 0.5 is : 0.7071067811865476
The square root of 81 is : 9
The square root of 13 is : 3.605551275463989
The square root of -4 is : NaN
```
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