Merge pull request #646 from apogeeoak/iterator

Added iterators5.rs exercise.

info.toml

@@ -744,6 +744,22 @@ a mutable variable. Or, you might write code utilizing recursion
 and a match clause. In Rust you can take another functional
 approach, computing the factorial elegantly with ranges and iterators."""
 
+[[exercises]]
+name = "iterators5"
+path = "exercises/standard_library_types/iterators5.rs"
+mode = "test"
+hint = """
+The documentation for the std::iter::Iterator trait contains numerous methods
+that would be helpful here.
+
+Return 0 from count_collection_iterator to make the code compile in order to
+test count_iterator.
+
+The collection variable in count_collection_iterator is a slice of HashMaps. It
+needs to be converted into an iterator in order to use the iterator methods.
+
+The fold method can be useful in the count_collection_iterator function."""
+
 # THREADS
 
 [[exercises]]