JavaScript Strings

In JavaScript, a string is a sequence of characters used to represent text. Strings are immutable, meaning their content cannot be changed after creation. JavaScript provides numerous methods for working with and manipulating strings.

Key Features of JavaScript Strings:

• Immutable: Once a string is created, its content cannot be altered directly. Any changes produce a new string.
• Indexed Characters: Characters in a string can be accessed using their index, starting from 0.
• Rich Methods: JavaScript strings offer many built-in methods for searching, transforming, and formatting text.

Example of Creating a JavaScript String:

This example demonstrates how to create a basic string and access its characters:

const greeting = "Hello, World!";
console.log(greeting[0]);  // H
console.log(greeting[7]);  // W
                    

Common String Methods:

JavaScript provides various methods for manipulating strings. Here are some common methods:

Using toUpperCase() and toLowerCase():

const text = "Hello, World!";
        
console.log(text.toUpperCase());  // HELLO, WORLD!
console.log(text.toLowerCase());  // hello, world!
                    

Using slice()to Extract Substrings:

const phrase = "JavaScript is awesome";
        
const part = phrase.slice(0, 10);
console.log(part);  // JavaScript
                    

Using replace() to Replace Text:

const sentence = "I love coding!";
const newSentence = sentence.replace("coding", "JavaScript");
        
console.log(newSentence);  // I love JavaScript!
                    

When to Use JavaScript Strings:

Strings are essential for managing and displaying text in JavaScript applications. They are widely used for handling user input, formatting data, and managing communication between users and applications.