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15 lines
709 B
Markdown
15 lines
709 B
Markdown
---
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layout: docs
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title: Iterator Combination
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permalink: /iterators/combinators
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---
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Amp provides two common combination helpers for iterators: `concat` and `merge`.
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## `concat()`
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`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).
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## `merge()`
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`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.
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