JavaScript Math sqrt( ) Method

Below is the example of the Math sqrt() Method.

  • Example:
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    <script type="text/javascript">
        document.write(Math.sqrt(-2) + "<br>"); 
        document.write(Math.sqrt(-2.56));          
    </script>

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  • Output:
    NaN
    NaN
    

The Math.sqrt() method in JavaScript is used to square root of the number passed as parameter to the function.
Syntax

Math.sqrt(value)

Parameters: This method accepts a single parameter as mentioned above and described below:

  • value which hold the number whose square root is to be calculated.

Returns: Square root of the number passed as parameter passed as parameter.

Below example illustrate the Mathe sqrt() method in JavaScript:



  • Example 1:
    Input : Math.sqrt(4)
    Output : 2
  • Example 2:
    Input : Math.sqrt(-4)
    Output : NaN
  • Errors and Exceptions:

    • A non-numeric string passed as parameter returns NaN
    • An array with more than 1 integer passed as parameter returns NaN
    • A negative number passed as parameter returns NaN
    • An empty string passed as parameter returns NaN
    • An empty array passed as parameter returns NaN

    More codes for the above method are as follows:
    Program 1:

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    <script type="text/javascript">
        document.write(Math.sqrt(2) + "<br>"); 
        document.write(Math.sqrt(2.56));          
    </script>

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    Output:

    1.4142135623730951
    1.6
    

    Program 2:

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    <script type="text/javascript">
        document.write(Math.floor("Geeksforgeeks"));          
    </script>

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    Output:

    NaN
    

    Program 3:

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    <script type="text/javascript">
        document.write(Math.floor(7.2+9.3));           
    </script>

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    Output:

    4.06201920231798

    Supported Browsers:

    • Google Chrome
    • Internet Explorer
    • Firefox
    • Opera
    • Safari

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