# How to convert a string to an array of numbers in JavaScript?

This tutorial explains multiple ways to convert a string containing numbers into an array of numbers.

You can check my other post on Javascript check substring exists in a String

For example, a String contains numbers with delimiter

``````var strNumbers = "9,21,12,8";
``````

The string contains numbers delimited by a comma.

And the output converted to Array

``````[ 9, 21, 12, 8 ]
``````

## #How to convert a string to an array of numbers in JavaScript?

There are multiple ways.

• use the map array function

First, the String of numbers is split using the `split()` function, which returns an Array of Strings.

Iterate the array using `map()`, and convert the string using `parseInt` with base 10

``````let arrayNumbers = strNumbers.split(",").map(function (strNumber) {
return parseInt(strNumber, 10);
});
``````

The same can be simplified using ES6 arrow functions

``````let arrayNumbers = strNumbers
.split(",")
.map((strNumber) => parseInt(strNumber, 10));
``````
• use Array from function

Pass the result of String.split function(),

`Array.from()` function, used to create an array from existing arrays.

An array of Strings is converted to a number array with a Number class format for conversion. Here is an example.

``````let array = Array.from(strNumbers.split(","), Number);
console.log(array);
``````
• Use Regular expression We can easily convert a String to an Array of numbers.
``````var strNumbers = "9,21,12,8";
const strArray = strNumbers.match(/\d+/g);
console.log(strArray) // ["9", "21", "12", "8"]

const arrayNumber = strArray?.map(Number);
console.log(arrayNumber) //[9, 21, 12, 8]

``````

In Example above,

• Regular expression used(`/\d+/g`).`\d` represents digits 0-9, `\d+` indicates matches with one or more digits, `/g` is a Global search
• The `match` function in the array returns all the matched numbers, It returns the array of Strings.
• Convert this string array to a number array using the map() function with the Number class.

## #Conclusion

In summary, Multiple ways to convert a string of numbers into an array of numbers with examples.