JS Practice — Built-in Objects

Symbol.for() — same key returns same Symbol

📖 Usage Example

Symbol.for('foo') === Symbol.for('foo')  // → true
Symbol('foo')    === Symbol('foo')       // → false

Symbol.for() looks up a global registry — the same key always returns the identical symbol.

Symbol.for(key)

Symbol.for(key) looks up a Symbol in the global registry. If not found, it creates one. Calling it twice with the same key returns the same Symbol.

Challenge: Verify that Symbol.for('foo') === Symbol.for('foo').

💡 Hints (1)