JavaScript Symbols

What are Symbols?

Symbols create unique identifiers. Each symbol is unique.

```javascript const sym1 = Symbol('id'); const sym2 = Symbol('id');

sym1 === sym2; // false (always unique!) ```

Using Symbols as Keys

```javascript const id = Symbol('id'); const user = { name: 'John', [id]: 123 }; ```

Key Takeaway

Symbols create unique values. Use as object keys for privacy. Each symbol is always unique.