Function forEach

forEach<T>(iterator, fn): void
Iterates over iterator (iterable/array), calling fn for each value. If fn returns false, iterator cancels.

Over the default JS forEach function, this one allows you to exit the iteration early.
Type Parameters
- T
  Type of iterable's values
Parameters
- iterator: Iterable<T> | T[]
  Iterable or array
- fn: ((v: T) => boolean | void)
  Function to call for each item. If function returns false, iteration cancels
  - - (v): boolean | void
    - Parameters
      v: T
      Returns boolean | void
Returns void
Example
```
import { Sync } from "https://unpkg.com/ixfx/dist/iterables.js"
Sync.forEach(count(5), () => console.log(`Hi`));  // Prints `Hi` 5x
Sync.forEach(count(5), i => console.log(i));      // Prints 0 1 2 3 4
Sync.forEach([0,1,2,3,4], i => console.log(i));   // Prints 0 1 2 3 4
```
Use forEach if you want to use an async iterator and async fn.

Alternatives:
- Flow.repeat/Flow.repeatSync: if you want to call something a given number of times and get the result