How do I continue using an iterator after calling take?

Question

I want to collect a few items from an iterator, then iterate through the rest, something like this:

let iterator = text.split_whitespace();
let first_ten_words = iterator.take(10).collect();

for word in iterator {
    // This should iterate over the remaining words.
}

This doesn't work because take() consumes the iterator.

Obviously I can use split_whitespace() twice and skip(10) but I assume that will do the splitting of the first 10 words twice, and therefore be inefficient.

Is there a better way to do it?

It may be a duplicate, but at least, this question and the accepted answer address the language general problem clearly. — Romain Vincent, Nov 12 '22 at 12:55

score 12 · Answer 1 · edited Jul 23 '19 at 22:12

12

You can use .by_ref() like this:

let iterator = text.split_whitespace();
let first_ten_words = iterator.by_ref().take(10).collect();

for word in iterator {
    // This should iterate over the remaining words.
}

edited Jul 23 '19 at 22:12

Shepmaster

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answered Jul 23 '19 at 21:50

Timmmm

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How do I continue using an iterator after calling take?

1 Answers1