The documentation of Iterator::for_each says:

In some cases for_each may also be faster than a loop, because it will use internal iteration on adapters like Chain .

Now I am wondering what kind of cases are there and if there are simple examples of this? I feel like the advice in this documentation is a bit contradicting, i.e. it says for loops are generally more idiomatic but they might be slower. So if performance is important to me does this mean I should always use for_each instead of for loops?

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