Javascript Math sign() Method

The Math.sign() is a built-in method 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 method accepts a single parameter number which represents the number whose sign you want to know. 

Return Value:

The Math.sign() method returns five different values as described below:

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

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

console.log(Math.sign(2));  

1

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

console.log(Math.sign(-2));  

-1

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

console.log(Math.sign(0)); 

0

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

console.log(Math.sign(-0));

-0

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

console.log(Math.sign(haa));  

Output:

NaN

We have a complete list of Javascript Math Objects methods, to check those please go through this Javascript Math Object Complete reference article.

Supported Browsers

• Chrome 51
• Edge 15
• Firefox 54
• Safari 10
• Opera 38