Fundamentals

Exercises to grasp and practice fundamental concepts in Ruby.

Hashes

Hashes have keys and values, and we can look up values easily if we have the key. (The inverse is not necessarily true.).

Word

Strings are everywhere. Let's munge them a bit.

Phrase

More string stuff.

Anagram

Scrabble

Notes

Arrays vs Hashes

def test_loop_in_array
  people = ["Alice", "Bob", "Charlie"]

  # wants one block parameter
  people.each do |person|
    person.inspect
  end
end

def test_loop_in_hash
  people = {"Annie" => 39, "Jim" => 10, "Barney" => 12}

  # wants two block parameters
  people.each do |name, age|
    "#{name} is #{age} years old"
  end
end