Javascript | Math.sign( ) Function

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: