JavaScript String split()

Introduction

The JavaScript String split() method is used to split a string into an array of substrings based on a specified separator and returns the new array. This method provides a way to extract individual parts of a string by breaking it down into smaller substrings.

Syntax

The syntax of the split() method is:

string.split(separator, limit)

• string is the original string to be split.
• separator (optional) is the string or regular expression that specifies where to split the string. If omitted, the entire string will be returned as the only element of the array.
• limit (optional) is the maximum number of splits to be performed. If specified, the array will have at most limit + 1 elements. If omitted, all possible splits will be performed.

Return Value

The split() method returns an array containing the substrings extracted from the original string.

Examples

Example 1: Basic Usage

const str = "Hello, world!";
const arr = str.split(',');

console.log(arr); // Output: ["Hello", " world!"]

• In this example, the split() method is called on the string str with a comma (,) as the separator. It returns an array with two elements: "Hello" and " world!".

Example 2: Split with Regular Expression

const sentence = "JavaScript is fun and powerful";
const words = sentence.split(/\s+/);

console.log(words); // Output: ["JavaScript", "is", "fun", "and", "powerful"]

• In this example, the split() method is called on the string sentence using a regular expression \s+ as the separator. It splits the sentence into separate words by considering one or more whitespace characters as the separator.

Example 3: Limiting the Number of Splits

const ipAddress = "192.168.0.1";
const octets = ipAddress.split('.', 2);

console.log(octets); // Output: ["192", "168"]

• In this example, the split() method is called on the string ipAddress with a dot (.) as the separator and a limit of 2. It splits the IP address into two parts, extracting the first two octets and returning them in the resulting array.

Conclusion

The split() method in JavaScript provides a convenient way to split a string into an array of substrings. It can be used with a specified separator or a regular expression to extract specific parts of a string. By limiting the number of splits, you can control the resulting array's size. Use this method whenever you need to break down a string into smaller parts.