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:

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.

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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