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.