zip

In std/seq.

fn zip<U>(self, other: Seq<U>) : List<Pair<T, U>>

Pairs of the elements of self and other at equal positions, as long as the shorter: [1, 2, 3] | zip(["a", "b"]) is [Pair(first = 1, second = "a"), Pair(first = 2, second = "b")].

fn zip<U>(self: Stream<T>, other: Seq<U>) : Seq<Pair<T, U>>
fn zip<U>(self, other: Stream<U>) : Seq<Pair<T, U>>
fn zip<U>(self: Stream<T>, other: Stream<U>) : Stream<Pair<T, U>>

Pairs of the elements of self and other at equal positions, where either is a Stream, until either ends: a Stream beside a Seq ends with it, as a Seq, and two Streams give a Stream.