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symbol ↔ immutable constant Primitive Value to rep unique Object property keys

to create a new symbol must call the new Symbol() Constructor Function

References​

  1. Symbol ↔ Autoboxing Wrapper for symbol Primitive to return unique immutable symbol

  2. Primitive Value ↔ undefined, null, number, bigint, boolean, string, symbol

  3. UNNBBSS ↔ undefined, null, number, bigint, boolean, string, symbol

  4. Property Key ↔ Label for property as string || symbol