The split() method separates an original string into an array of substrings, based on a separator string that you pass as input. The original string is not altered by split().


const splitStr = str.split(separator, limit);
  • separator - a string indicating where each split should occur
  • limit - a number for the amount of splits to be found


const str = "Hello. I am a string. You can separate me.";
const splitStr = str.split("."); // Will separate str on each period character

console.log(splitStr); // [ "Hello", " I am a string", " You can separate me", "" ]
console.log(str); // "Hello. I am a string. You can separate me."

Since we used the period (.) as the separator string, the strings in the output array do not contain the period in them – the output separated strings do not include the input separator itself.

You can operate on strings directly, without storing them as variables:

"Hello... I am another string... keep on learning!".split("..."); // [ "Hello", " I am another string", " keep on learning!" ]

Also, string separator does not have to be a single character, it can be any combination of characters:

const names = "Kratos- Atreus- Freya- Hela- Thor- Odin";
const namesArr = names.split("- "); // Notice that the separator is a dash and a space
const firstThreeNames = names.split("- ", 3);

console.log(namesArr) // [ "Kratos", "Atreus", "Freya", "Hela", "Thor", "Odin" ]
console.log(firstThreeNames); // [ "Kratos", "Atreus", "Freya" ]

Common Uses of split

The split() method is very useful once you grasp the basics. Here are a few common use cases for split():

Create an array of words from a sentence:

const sentence = "Ladies and gentlemen we are floating in space.";
const words = sentence.split(" "); // Split the sentence on each space between words

console.log(words); // [ "Ladies", "and", "gentlemen", "we", "are", "floating", "in", "space." ]

Create an array of letters in a word:

const word = "space";
const letters = word.split("");

console.log(letters); // [ "s", "p", "a", "c", "e" ]

Reversing the letters in a word:

Because the split() method returns an array, it can be combined with array methods like reverse() and join():

const word = "float";
const reversedWord = word.split("").reverse().join("");

console.log(reversedWord); // "taolf"

That's all you need to know to split() strings with the best of 'em!