feat(iterators): update hint comments

Author: manyinsects

exercises/standard_library_types/iterators1.rs

@@ -6,7 +6,7 @@
 // This module helps you get familiar with the structure of using an iterator and
 // how to go through elements within an iterable collection.
 //
-// Execute `rustlings hint iterators1` for hints :D
+// Execute `rustlings hint iterators1` or use the `hint` watch subcommand for a hint.
 
 // I AM NOT DONE
 

exercises/standard_library_types/iterators2.rs

@@ -1,7 +1,7 @@
 // iterators2.rs
 // In this exercise, you'll learn some of the unique advantages that iterators
 // can offer. Follow the steps to complete the exercise.
-// As always, there are hints if you execute `rustlings hint iterators2`!
+// Execute `rustlings hint iterators2` or use the `hint` watch subcommand for a hint.
 
 // I AM NOT DONE
 

exercises/standard_library_types/iterators3.rs

@@ -4,7 +4,7 @@
 // 1. Complete the divide function to get the first four tests to pass.
 // 2. Get the remaining tests to pass by completing the result_with_list and
 //    list_of_results functions.
-// Execute `rustlings hint iterators3` to get some hints!
+// Execute `rustlings hint iterators3` or use the `hint` watch subcommand for a hint.
 
 // I AM NOT DONE
 

exercises/standard_library_types/iterators4.rs

@@ -1,4 +1,5 @@
 // iterators4.rs
+// Execute `rustlings hint iterators4` or use the `hint` watch subcommand for a hint.
 
 // I AM NOT DONE
 

exercises/standard_library_types/iterators5.rs

@@ -6,7 +6,7 @@
 // imperative style for loops. Recreate this counting functionality using
 // iterators. Only the two iterator methods (count_iterator and
 // count_collection_iterator) need to be modified.
-// Execute `rustlings hint iterators5` for hints.
+// Execute `rustlings hint iterators5` or use the `hint` watch subcommand for a hint.
 //
 // Make the code compile and the tests pass.
 
@@ -34,6 +34,7 @@ fn count_for(map: &HashMap<String, Progress>, value: Progress) -> usize {
 fn count_iterator(map: &HashMap<String, Progress>, value: Progress) -> usize {
     // map is a hashmap with String keys and Progress values.
     // map = { "variables1": Complete, "from_str": None, ... }
+    todo!();
 }
 
 fn count_collection_for(collection: &[HashMap<String, Progress>], value: Progress) -> usize {
@@ -52,6 +53,7 @@ fn count_collection_iterator(collection: &[HashMap<String, Progress>], value: Pr
     // collection is a slice of hashmaps.
     // collection = [{ "variables1": Complete, "from_str": None, ... },
     //     { "variables2": Complete, ... }, ... ]
+    todo!();
 }
 
 #[cfg(test)]

info.toml

@@ -802,7 +802,8 @@ case is a vector of integers and the failure case is a DivisionError.
 The list_of_results function needs to return a vector of results.
 
 See https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.collect for how 
-the `FromIterator` trait is used in `collect()`."""
+the `FromIterator` trait is used in `collect()`. This trait is REALLY powerful! It
+can make the solution to this exercise infinitely easier."""
 
 [[exercises]]
 name = "iterators4"
@@ -812,7 +813,9 @@ hint = """
 In an imperative language, you might write a for loop that updates
 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."""
+approach, computing the factorial elegantly with ranges and iterators.
+
+Hint 2: Check out the `fold` and `rfold` methods!"""
 
 [[exercises]]
 name = "iterators5"