How to Split a Number into an Array in JavaScript

Split a number into an Array using toString().split() in JavaScript

One way to split a number into an array of its individual digits in JavaScript is to use the toString() method to convert the number to a string, then use the split() method to create an array of characters. Finally, use the map() method to convert each character back to a number. Here’s an example:

In this example,

num.toString() converts the number 12345 to a string "12345".

The split('') method splits the string into an array of characters ["1", "2", "3", "4", "5"]. Finally, the map() method converts each character back to a number.

You can also use arrow function syntax instead of a regular function:

When splitting a number into an array of its individual digits in JavaScript, it may be useful to define a reusable function for this purpose. This can improve the readability and maintainability of your code by making the process more explicit and reducing duplication.

Here’s an example of a reusable function that splits a number into an array of its digits:

In this example, the numArray function takes a number as an argument and returns an array of its individual digits. The function uses the same approach as described earlier, converting the number to a string, splitting it into an array of characters, and then converting each character back to a number. By defining this as a reusable function, it can be easily used in multiple places throughout your code.

Read: How to Convert a Map to an Array in JavaScript

Using Array.from() Method

To split a number into an array of its individual digits in JavaScript, you can use the Array.from() method. This method creates a new, shallow-copied Array instance from an array-like or iterable object.

To split a number, first, convert it to a string using String(num) and pass the result as the first argument to Array.from(). The second argument is the Number constructor, which is used to convert each character in the string to a number.

Here’s an example:

In this example, String(num) converts the number 12345 to a string "12345", and Array.from(String(num), Number) creates an array of numbers [1, 2, 3, 4, 5] from the characters in the string.