Function map

map<T, U>(iterable, f): Iterable<U>
The equivalent of Array.prototype.map for iterators.
Type Parameters
- T
- U
Parameters
- iterable: Iterable<T, any, any>
  The iterator to map over.
- f: ((x: T, index: number) => U)
  The mapping function.
  - - (x, index): U
    - Parameters
      x: T
      index: number
      Returns U
Returns Iterable<U>