JavaScript has multiple global **number methods** that make it easy to work with numbers. In this shot, we will cover the new and improved number methods introduced with ES6.


|       Number method      |                                     Description                                    |
|:------------------------:|:-----------------------------------------------------------------------------------|
| `Number.isInteger()`     | Determines if the passed value is an integer.                                 |
| `Number.isNaN()`         | Determines if the passed value is NaN.                                        |
| `Number.isFinite()`      | Determines if the passed value is a finite number.                            |
| `Number.isSafeInteger()` | Determines if the passed value is a [safe integer](https://www.educative.io/edpresso/what-is-a-safe-integer-in-es6) (between $(-2^{53}, 2^{53})$ |
| `Number.parseInt()`      | Parses a string argument and returns an integer of the specified radix.            |
| `Number.parseFloat()`    | Parses a string argument and returns a float representation of the passed string.  |

> A lot of these functions are not new. For example, JavaScript has had a method called `isNaN()` that is exposed through the `window` object. However, these functions have issues that ES6 number methods aim to solve.

## Code

Examples of using `Number.isInteger()`:

// prints 'true'
console.log(Number.isInteger(10));

// prints 'false'
console.log(Number.isInteger(10.5));

// prints 'true'
console.log(Number.isNaN(0/0));

// prints 'false'
console.log(Number.isNaN(undefined));

// prints 'true'
console.log(Number.isFinite(10));

// prints 'false'
console.log(Number.isFinite(null));

Examples of using `Number.isSafeInteger()`:

// prints 'true'
console.log(Number.isSafeInteger(10));

// prints 'false'
console.log(Number.isSafeInteger(Math.pow(2, 53)));

// Prints '-5'
console.log(Number.parseInt('-5'));

// Prints '4'
console.log(Number.parseInt('100', 2));

// Prints '10'
console.log(Number.parseFloat('10'));

// Prints 'NaN'
console.log(Number.parseFloat('test'));

Number method	Description
`Number.isInteger()`	Determines if the passed value is an integer.
`Number.isNaN()`	Determines if the passed value is NaN.
`Number.isFinite()`	Determines if the passed value is a finite number.
`Number.isSafeInteger()`	Determines if the passed value is a safe integer (between $(-2^{53}, 2^{53})$
`Number.parseInt()`	Parses a string argument and returns an integer of the specified radix.
`Number.parseFloat()`	Parses a string argument and returns a float representation of the passed string.

Global number methods in ES6

Code