Javascript | Math.sign( ) Function

The Math.sign() is a built-in 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. 

Output:

1

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

Output:

-1

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

Output:

0

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

Output:

-0

Example 5: When an invalid number is passed as an argument: 

Output:

NaN