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JavaScript Number isFinite() Method

JavaScript Number isFinite() Method with example, javascript math methods, abs() method, round() method, ceil() method, floor() method, pow() method, random() method, sqrt() method, max() method, min() method, log() method, sin() method, cos() method, tan() method etc.

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JavaScript Number isFinite() method

The JavaScript number isFinite() method determines whether the given value is a finite number. It returns true if the value is a finite number, otherwise it returns false.

Syntax

The isFinite() method is represented by the following syntax:

Number.isFinite(num)

Parameter

num - A number to be checked.

Return

A Boolean value.

JavaScript Number isFinite() method example

Here, we will understand isFinite() method through various examples.

Example 1

Let's see a simple example of isFinite() method.

<script>
var x=0;
var y=1;
var z=-1;
document.writeln(Number.isFinite(x));
document.writeln(Number.isFinite(y));
document.writeln(Number.isFinite(z)); 
</script>
Test it Now

Output:

true true true

Example 2

In this example, we will use isFinite() method with negative numbers.

<script>
function check(x,y)
{
  return x/y;
}
document.writeln(Number.isFinite(check(0,10)));
document.writeln(Number.isFinite(check(10,0))); 
</script>
Test it Now

Output:

true false

Example 3

Let's see isFinite() method with some different test cases.

<script>
document.writeln(Number.isFinite(Infinity));
document.writeln(Number.isFinite(-Infinity));
document.writeln(Number.isFinite(NaN)); 
</script>
Test it Now

Output:

false false false

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