Function map

map<V, X>(it, f): Generator<X, void, unknown>
Maps an iterable of type V to type X.
```
map([1, 2, 3], e => e*e)
returns [1, 4, 9]
```
Type Parameters
- V
- X
Parameters
- it: Iterable<V>
- f: ((v: V) => X)
  - - (v): X
    - Parameters
      v: V
      Returns X
Returns Generator<X, void, unknown>