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Symbols + Maps have some neat gotchas that are good to be aware of. For example, if you use Symbols as keys in an object, Object.keys() or for...of/in will NOT

by winrid 5y ago

Symbols + Maps have some neat gotchas that are good to be aware of. For example, if you use Symbols as keys in an object, Object.keys() or for...of/in will NOT return/iterate over those keys. You have to use Object.getOwnPropetySymbols()...