JavaScript String Methods

In JavaScript, there are several built-in methods for manipulating strings. Here are some commonly used ones:

1. length: returns the length of the string

let str = 'Hello, World!';
console.log(str.length); // Outputs: 13

2. toUpperCase(): converts the string to uppercase

let str = 'Hello, World!';
console.log(str.toUpperCase()); // Outputs: HELLO, WORLD!

3. toLowerCase(): converts the string to lowercase

let str = 'Hello, World!';
console.log(str.toLowerCase()); // Outputs: hello, world!

4. indexOf(): returns the index of the first occurrence of a specified substring

let str = 'Hello, World!';
console.log(str.indexOf('o')); // Outputs: 4

5. substring(): returns a substring of the string

let str = 'Hello, World!';
console.log(str.substring(0, 5)); // Outputs: Hello

6. replace(): replaces a specified substring with another string

let str = 'Hello, World!';
console.log(str.replace('World', 'Universe')); // Outputs: Hello, Universe!

7.split(): splits a string into an array of substrings

let str = 'Hello, World!';
console.log(str.split(',')); // Outputs: ['Hello', ' World!']

8. trim(): removes whitespace from the beginning and end of a string

let str = '   Hello, World!   ';
console.log(str.trim()); // Outputs: Hello, World!

9.charAt(): returns the character at a specified index

let str = 'Hello, World!';
console.log(str.charAt(4)); // Outputs: o

10. endsWith(): checks if a string ends with a specified substring

let str = 'Hello, World!';
console.log(str.endsWith('!')); // Outputs: true

11. startsWith(): checks if a string starts with a specified substring

let str = 'Hello, World!';
console.log(str.startsWith('Hello')); // Outputs: true

12.includes(): checks if a string contains a specified substring

let str = 'Hello, World!';
console.log(str.includes('World')); // Outputs: true

String manipulation is a common task in web development, and understanding string methods is essential for working with strings effectively in JavaScript. The above methods are just a few examples of the many built-in string methods available in JavaScript.