JavaScript | Math.floor() function

The Math.floor() function in JavaScript is used to round off the number passed as a parameter to its nearest integer in Downward direction of rounding i.e. towards the lesser value.

Syntax

Math.floor(value)

Parameters: This function accepts a single parameter value which is number to be rounded to its nearest integer in downward rounding method.
Returns: Result after rounding the number passed as a parameter to the function.passed as parameter.
Example:



Input  : Math.floor(4.23)
Output : 4

Input  : Math.floor(0.8)
Output : 0

Errors and Exceptions:

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

Below are some examples that illustrate the Math.floor() function in JavaScript:
Example 1:

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

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Output:


-2
-3



Example 2:











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<!-- POSITIVE NUMBER EXAMPLE -->


<script type="text/javascript"> 


    document.write(Math.floor(2) + "<br>");  


    document.write(Math.floor(2.56));           


</script> 



















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Output:


2
2



Example 3:











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<!-- STRING EXAMPLE -->


<script type="text/javascript"> 


    document.write(Math.floor("Geeksforgeeks"));           


</script> 



















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Output:


NaN



Example 4:











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<!-- ADDITION INSIDE FUNCTION EXAMPLE -->


<script type="text/javascript"> 


    document.write(Math.floor(7.2+9.3));            


</script> 



















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Output:


16



Supported Browsers: The browsers supported by JavaScript Math.floor( ) function are listed below:


    

  • Google Chrome
    • 

  • Internet Explorer
    • 

  • Firefox
    • 

  • Opera
    • 

  • Safari
    • 




          
          
          
          

            

    

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