Below please find links to archived Q&A discussion for the Hashes and Symbols course.
Hashes and Symbols
Exercise 1.1: The Story So FarExercise 1.2: Iterating Over HashesExercise 1.3: Nil: a Formal IntroductionExercise 1.4: Setting Your Own DefaultExercise 1.5: A Key of a Different Color
Exercise 2.1: What's a Symbol?Exercise 2.2: Symbol SyntaxExercise 2.3: What are Symbols Used For?Exercise 2.4: Converting Between Symbols and StringsExercise 2.5: Many Paths to the Same Summit
Exercise 3.1: All Aboard the Hash Rocket!Exercise 3.2: The Hash Rocket Has LandedExercise 3.3: Dare to CompareExercise 3.4: Becoming More SelectiveExercise 3.5: More Methods, More Solutions