# Javascript Learn Infinity Property Basics|number isFinite method example ## What is infinity in JavaScript?

`Infinity` is a global object property. It is used to represent the maximum value of a number. It contains values of `POSITIVE_INFINITY` and `NEGATIVE_INFINITY`. number in javascript is always less than `POSITIVE_INFINITY`

It is used to represent the result of mathematical calculations with overflow or underflow values.

## Infinity Property in javascript

`Infinity` is a property of a javascript Global Object, that specifies positive values of numeric data. The default value of `infinity` is Number.POSITIVE_INFINITY:

It represents the Mathematical Infinity value. In mathematical calculations, Any value divided by Zero is returned by infinity.

Syntax:

``Infinity;``

## Javascript Infinity Example

The number value is divided by Zero. and the Infinity value is always the largest value of any numeric value When you are adding/multiply any value with infinity will get an Infinity

``````console.log(123 / 0); // Infinity
console.log(Infinity); // Infinity
console.log(Infinity - Infinity); // NaN
console.log(Infinity + Infinity); // Infinity
console.log(Infinity * Infinity); // Infinity``````

Infinity value is represented in Positive and Negative Number.POSITIVE_INFINITY - Represents Positive infinite values - Infinity Number.NEGATIVE_INFINITY - Represents Negative Infinite value - -Infinity Infinity property usages

1. This will be used to check arithmetic operations result in comparison with Infinity.
2. This will also be used to store the infinite value of any calculations
3. Checking infinite value for Division

## How to compare Infinity value in javascript

`Infinity` can be used as a variable in conditional if the expression

``````var value = 45;
if (45< Infinity>)
console.log('Value is less than the infinite value')``````

output is

``Value is less than the infinite value``

## javascript Number isFinite() methods

`isFinite()` is defined in the `Number` Object. isFinite() method checks the value for a finite number, returns true for a finite number, and false for an infinite number.

Syntax:

``Number.isFinite(numericvalule);``

The example Following is To check Given number is finite or infinite using the isFinite() method.

``````console.log(Number.isFinite(123)); // true
console.log(Number.isFinite(Infinity)); //false
console.log(Number.isFinite(null)); //false
console.log(Number.isFinite(NaN)); //false
console.log(Number.isFinite(-Infinity)); //false
console.log(Number.isFinite(undefined)); //false``````