JavaScript Strings

In JavaScript, strings are used to represent textual data. They are sequences of characters enclosed within either single quotes (') or double quotes (").

Example

let str1 = 'Hello, World!';
let str2 = "JavaScript";

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Output

String Methods:

JavaScript provides a variety of built-in methods to manipulate strings:

Length: Returns the length of the string.

Example

console.log(str1.length); // Output: 13

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Output

charAt(index): Returns the character at the specified index.

Example

console.log(str1.charAt(0)); // Output: H

concat(str1, str2, ...): Concatenates two or more strings.

Example

let fullName = str1.concat(' ', str2);
console.log(fullName); // Output: Hello, World! JavaScript

indexOf(substring): Returns the index within the calling string of the first occurrence of the specified substring.

Example

console.log(str1.indexOf('World')); // Output: 7

slice(start, end): Extracts a section of a string and returns it as a new string.

Example

console.log(str1.slice(0, 5)); // Output: Hello

toUpperCase(): Converts the string to uppercase.

Example

console.log(str2.toUpperCase()); // Output: JAVASCRIPT

toLowerCase(): Converts the string to lowercase.

Example

console.log(str2.toLowerCase()); // Output: javascript

split(separator): Splits a string into an array of substrings based on a specified separator.

Example

let words = str1.split(' ');
console.log(words); // Output: ["Hello,", "World!"]