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Javascript | Math.sign( ) Function
  • Last Updated : 13 Aug, 2019

The Math.sign() is a builtin function in JavaScript and is used to know the sign of a number, indicating whether the number specified is negative or positive.

Syntax:

Math.sign(number)

Parameters: This function accepts a single parameter number which represents the number whose sign you want to know.

Return Value: The Math.sign() function returns five different values as described below:

  1. It returns 1 if the argument passed is a positive number.
  2. It returns -1 if the argument passed is a negative number.
  3. It returns 0 if the argument passed is a positive zero.
  4. It returns -0 if the argument passed is a negative zero.
  5. If none of the above cases match,it returns Nan.

Examples:



Input  : Math.sign(2)
Output : 1
     
Input  : Math.sign(-2)
Output : -1

Input  : Math.sign(0)
Output : 0

Input  : Math.sign(-0)
Output : -0

Input  : Math.sign(haa)
Output  : NaN

Below programs illustrates the Math.sign() function in JavaScript:

  • Example 1: When a positive number is passed as an argument.




    <script type="text/javascript">
       document.write(Math.sign(2));          
    </script>

    Output:

    1
  • Example 2: When a negative number is passed as an argument:




    <script type="text/javascript">
       document.write(Math.sign(-2));          
    </script>

    Output:

    -1
  • Example 3: When a positive zero is passed as an argument:




    <script type="text/javascript">
       document.write(Math.sign(0));          
    </script>

    Output:

    0
  • Example 4: When a negative zero is passed as an argument:




       
    <script type="text/javascript">
        document.write(Math.sign(-0));          
     </script>

    Output:

    -0
  • Example 5: When an invalid number is passed as an argument:




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

    Output:

    NaN

    Supported Browsers: The browsers supported by Javascript Math.sign( ) Function are listed below:

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

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