Which loop is faster, while or for?

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That clearly depends on the particular implementation of the interpreter/compiler of the specific language.

That said, theoretically, any sane implementation is likely to be able to implement one in terms of the other if it was faster so the difference should be negligible at most.

Of course, I assumed while and for behave as they do in C and similar languages. You could create a language with completely different semantics for while and for

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