Mapped types iterate over keys of a type to produce a new type. Syntax: { [K in keyof T]: NewType }. Modifiers (+/- readonly, +/- ?) add or remove property attributes. Key remapping (as clause) renames keys. Mapped types power Partial, Required, Readonly, and Record internally.
The 5-Mode Loop
5 of 5 modes available
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Before this, understand: generics ts