JS Built-ins
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SymbolhasInstanceintermediate

Symbol.hasInstance — not in global registry

📖 Usage Example
Symbol.keyFor(Symbol.hasInstance)  // → undefined

Well-known symbols are not registered in the global string-keyed registry.

Symbol.hasInstance is a Well-Known Symbol

Symbol.hasInstance !== Symbol('Symbol.hasInstance') — it is distinct from a locally created symbol.

Challenge: Verify they are not equal.

💡 Hints (1)
  • • Well-known symbols are not registered in the global string-keyed registry.