amp/docs/iterators/combinators.md

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Iterator Combination

Amp provides two common combination helpers for iterators: concat and merge.

concat()

concat() accepts an array of Iterator instances and concatenates the given iterators into a single iterator, emitting values from a single iterator at a time. The prior iterator must complete before values are emitted from any subsequent iterators. Iterators are concatenated in the order given (iteration order of the array).

merge()

merge() accepts an array of Iterator instances and creates an Iterator that emits values emitted from any iterator in the array of iterators ending once all emitters completed.