JavaScript Default Parameters

Setting Default Values

Provide fallback values for parameters.

```javascript function greet(name = 'Guest') { return `Hello, ${name}!`; }

greet(); // "Hello, Guest!" greet('John'); // "Hello, John!" ```

Multiple Defaults

```javascript function createUser(name, age = 18, isActive = true) { return { name, age, isActive }; } ```

Key Takeaway

Default parameters provide fallback values. Use when parameter might be undefined. Makes functions more flexible.