String Object

The String object is a wrapper for string primitives. It provides methods for manipulating and inspecting text. Strings are immutable; methods return new strings.

Key Points

• Properties: length.
• Methods: charAt(), indexOf(), slice(), substring(), split(), replace(), toUpperCase(), trim(), etc.
• Template literals (backticks) allow interpolation and multi‑line strings.

Code Example

const str = "Hello, World!";
console.log(str.length); // 13
console.log(str.charAt(0)); // "H"
console.log(str.indexOf("World")); // 7
console.log(str.slice(7, 12)); // "World"
console.log(str.toUpperCase()); // "HELLO, WORLD!"
console.log(str.replace("World", "JavaScript")); // "Hello, JavaScript!"

const name = "Alice";
const greeting = `Hello, ${name}!`; // template literal
console.log(greeting); // "Hello, Alice!"