The abs method in JavaScript is used to obtain the absolute value of a specified number. This method is considered a static function of the Math object.
Syntax
The syntax for the abs method is as follows:
Example
Math.abs(num)
Parameter
num - A number.
Return
An absolute value of a number.
JavaScript Math abs method example
In this section, we will explore the abs function by examining multiple examples.
Example 1
Consider the following illustration that demonstrates how to output the absolute value of a given number.
Example
<script>
document.writeln(Math.abs(-4)+"<br>");
document.writeln(Math.abs(-7.8)+"<br>");
document.writeln(Math.abs('-4'));
</script>
Output:
Output
4
7.8
4
Example 2
Let’s explore several scenarios in which the abs function yields a result of 0.
Example
<script>
document.writeln(Math.abs(null)+"<br>");
document.writeln(Math.abs([])+"<br>");
document.writeln(Math.abs(''));
</script>
Output:
Output
0
0
0
Example 3
Let’s explore scenarios in which the abs function yields NaN.
Example
<script>
document.writeln(Math.abs("string")+"<br>");
document.writeln(Math.abs([2,3])+"<br>");
document.writeln(Math.abs());
</script>
Output:
Output
NaN
NaN
NaN
Example 4
Let’s explore the abs function by creating some of your own test scenarios.
Example
<script>
function display()
{
var x=document.getElementById("num").value;
document.getElementById("result").innerHTML=Math.abs(x);
}
</script>
<form>
Enter a number: <input type="text" id="num">
<input type="button" onclick="display()" value="submit">
</form>
<p><span id="result"></span></p>
