Mapping callback used by iterator helpers.
const label: MapCallback<number, string, string> = (value, key) => `${key}:${value}`; Copy
const label: MapCallback<number, string, string> = (value, key) => `${key}:${value}`;
Iterated value type.
Iterated key type.
Mapped result type.
Maps one iterated value.
Current value.
Current key.
Zero-based iteration index.
Total number of values in the traversal.
Mapped value.
Mapping callback used by iterator helpers.
Example