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next / express / next-routes
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Figure out the raw iterator function of a thing
MapperFunctionType<A, B> => Array | Set | Record<string | number | symbol, B> | Map<B, A> | string => Array | Set | Record<string | number | symbol, B> | Map<B, A> | string
Takes any kind of enumerable and figures out the best way to iterate over it.
forEach((x) => y)([])
forEach((x) => y)(new Map)
forEach((x) => y)({})