What is the yield keyword used for in C#?
In the How Can I Expose Only a Fragment of IList<> question one of the answers had the following code snippet:
IEnumerable-
The C# yield keyword, to put it simply, allows many calls to a body of code, referred to as an iterator, that knows how to return before it's done and, when called again, continues where it left off - i.e. it helps an iterator become transparently stateful per each item in a sequence that the iterator returns in successive calls.
In JavaScript, the same concept is called Generators.
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