Function map

map<T, U>(object, fn): IterableIterator<U>
Transform the values of an iterable with a mapping function.
Type Parameters
- T
- U
Parameters
- object: Iterable<T>
  The iterable object of interest.
- fn: ((value, index) => U)
  The mapping function to invoke for each value.
  - - (value, index): U
    - Parameters
      value: T
      index: number
      Returns U
Returns IterableIterator<U>
An iterator which yields the transformed values.

Example
```
import { map } from '@lumino/algorithm';

let data = [1, 2, 3];

let stream = map(data, value => value * 2);

Array.from(stream);  // [2, 4, 6]
```
- Defined in map.ts:30