String

`String.prototype.split`

Divides a string into an ordered list of substrings and returns them as an array

Syntax

JavaScript

string.split(separator, limit?)

Parameters

Parameter	Type	Description
separator	string \| RegExp	Pattern describing where each split should occur
limit	number	Maximum number of substrings to include

Return Value

An array of strings

Examples

Basic Usage

const str = 'Hello World Foo';
console.log(str.split(' ')); // ['Hello', 'World', 'Foo']

Practical Example

const csv = 'name,age,city';
const fields = csv.split(',');
console.log(fields); // ['name', 'age', 'city']

Advanced Usage

const str = 'camelCaseString';
const words = str.split(/(?=[A-Z])/);
console.log(words); // ['camel', 'Case', 'String']

Understanding String.prototype.split

The String.prototype.split method in JavaScript divides a string into an ordered list of substrings and returns them as an array. It belongs to the String object and is one of the most widely used methods for working with string values in modern JavaScript and TypeScript applications.

The method signature is string.split(separator, limit?). It accepts 2 parameters: separator, limit. When called, it returns an array of strings. Understanding when and how to use split() helps you write more expressive, readable code.

Common use cases for String.prototype.split include data transformation, input validation, API response processing, and building reusable utility functions. It works well alongside related methods like array-join, string-slice, string-match, enabling you to chain operations together for complex data manipulation pipelines.

Browser support for String.prototype.split is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. It is also fully supported in Node.js and Deno. For older environments, transpilation with Babel or a polyfill may be needed.