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{{Refimprove|date=July 2007}}
In [[computer science]], a '''generator''' is a [[subroutine|routine]] that can be used to control the [[iteration]] behaviour of a [[control flow#Loops|loop]]. All generators are also [[iterator]]s.<ref>[https://stackoverflow.com/q/1022564 What is the difference between an Iterator and a Generator?]</ref> A generator is very similar to a [[Function (computer programming)|function]] that returns an array, in that a generator has parameters, can be called, and generates a sequence of values. However, instead of building an array containing all the values and returning them all at once, a generator yields the values one at a time, which requires less memory and allows the caller to get started processing the first few values immediately. In short, a generator ''looks like'' a function but ''behaves like'' an [[iterator]].
Generators can be implemented in terms of more expressive [[control flow]] constructs, such as [[coroutine]]s or first-class [[continuation]]s.<ref>{{cite web
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