JS Practice — Built-in Objects

Symbol.for() — keyFor retrieves the key

📖 Usage Example

const s = Symbol.for('app')
Symbol.keyFor(s)   // → 'app'

Symbol.keyFor() retrieves the registration key used with Symbol.for().

Symbol.keyFor

Symbol.keyFor(sym) returns the key used to register a global symbol.

Challenge: Verify that Symbol.keyFor(Symbol.for('app')) === 'app'.

💡 Hints (1)