What is the use of Math.abs() method in JavaScript?

Math.abs()

Math.abs() gives absolute value of a number, that is

                                                       p  if p > 0
                               Math.abs(p) =  |p| = {  0  if p = 0                                                                                         -p  if p < 0

If the above mathematical notation is observed , when p is positive the absolute value took positive p and when the value is negative absolute value take -(p).For suppose let the value of p be -5 then according to the above notation the absolute value takes -p that is -(-5) which is equal to +5.So, from this we can get that absolute value gives only positive value irrespective of sign of the number whether positive or negative.

In the following example the absolute value of the difference between 1 and 9 is positive despite the actual value is negative(-8).

Example-1

<html>
<body>
<script>
   function myDiff(a, b) {
      return Math.abs(a - b);
   }
   document.write(myDiff(1, 9));
</script>
</body>
</html>

Output

Example-2

The following example returns a positive value rather than given negative value using Math.abs() method.

<html>
<body>
<p id="absolute"></p>
<script>
   document.getElementById("absolute").innerHTML = Math.abs(-5.13);
</script>
</body>
</html>

Output

5.13