JavaScript Truthy and Falsy

Falsy Values

These are considered false:

```javascript false 0 '' (empty string) null undefined NaN ```

Truthy Values

Everything else is truthy:

```javascript true 1 'hello' [] {} ```

Usage

```javascript if (user) { // Runs if user is truthy }

const result = value || 'default'; ```

Key Takeaway

Falsy values are false, null, undefined, 0, '', NaN. Everything else is truthy. Important for conditionals.