Merge pull request #1391 from ktheory/ktheory/iter5
docs: clarify instructions on iterators5.rs
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// Let's define a simple model to track Rustlings exercise progress. Progress
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// will be modelled using a hash map. The name of the exercise is the key and
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// the progress is the value. Two counting functions were created to count the
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// number of exercises with a given progress. These counting functions use
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// imperative style for loops. Recreate this counting functionality using
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// iterators. Only the two iterator methods (count_iterator and
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// count_collection_iterator) need to be modified.
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// number of exercises with a given progress. Recreate this counting
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// functionality using iterators. Try not to use imperative loops (for, while).
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// Only the two iterator methods (count_iterator and count_collection_iterator)
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// need to be modified.
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// Execute `rustlings hint iterators5` or use the `hint` watch subcommand for a hint.
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//
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// Make the code compile and the tests pass.
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// I AM NOT DONE
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