JS Strings

JS Strings

Strings represent text in JavaScript. You can create them using single quotes, double quotes, or backticks.

let a = "Hello";
let b = 'World';
let c = `JavaScript`;

JS String Templates

Template literals use backticks (`) and allow embedded expressions using ${ }.

let name = "Ozan";
let message = `Hello, ${name}!`;

console.log(message);

Template literals also support multi-line strings.

let text = `Line one
Line two
Line three`;

console.log(text);

JS String Methods

Strings have built-in methods to manipulate text.

let str = "JavaScript";

console.log(str.length);         // 10
console.log(str.toUpperCase());  // JAVASCRIPT
console.log(str.toLowerCase());  // javascript
console.log(str.slice(0, 4));    // Java
console.log(str.replace("Java", "Type")); // TypeScript

Common methods include trim(), includes(), startsWith(), and endsWith().

let text2 = "  Hello JS  ";

console.log(text2.trim());
console.log(text2.includes("JS"));
console.log(text2.startsWith("He"));

JS String Search

You can search inside strings using different methods.

let phrase = "Learn JavaScript easily";

console.log(phrase.indexOf("Java"));   // position
console.log(phrase.lastIndexOf("a"));  // last match
console.log(phrase.search("Script"));  // search
console.log(phrase.match(/Java/));      // RegExp match

JS String Reference

Strings are immutable, meaning methods return new strings instead of modifying the original value.

let original = "Hello";
let updated = original.toUpperCase();

console.log(original); // Hello
console.log(updated);  // HELLO

For a complete list of string methods, refer to the JavaScript reference documentation.

Next Step

Continue with JS Numbers to learn how JavaScript handles numeric values and calculations.