References

summary
private	F * _zip(iterables: Iterable[]): IterableIterator Zips iterables together.
private	F * _zip2(A: Iterable, B: Iterable): IterableIterator Zips exactly two iterables together.
private	F * _ziplongest(fillvalue: any, iterables: Iterable[]): IterableIterator Same as _zip, but continues to yield zipped tuples until the last iterable is exhausted.
public	F enumerate(iterable: Iterable, start: number): IterableIterator Yields (index,element) tuples where the elements are taken from the input iterable.
public	F zip(iterables: ...Iterable): IterableIterator Zips iterables together.
public	F ziplongest(fillvalue: any, iterables: ...Iterable): IterableIterator Same as zip, but continues to yield zipped tuples until the last iterable is exhausted.