Ruby Basics 2

anagrams_for.rb

# The dictionary is just an arbitrary collection of strings.
# It need not contain English words, e.g., 'etlsm'.
dictionary = ['acres', 'cares', 'Cesar', 'races', 'smelt', 'melts', 'etlsm']

# If the input word happens to be in the dictionary, it should be in the the returned array, too.
# The list should also be case-insensitive.
anagrams_for('acres', dictionary)   # => ['acres', 'cares', 'Cesar', 'races']
anagrams_for('ACRES', dictionary)   # => ['acres', 'cares', 'Cesar', 'races']
anagrams_for('Cesar', dictionary)   # => ['acres', 'cares', 'Cesar', 'races']

# Although "sacre" is not *in* the dictionary, several words in the dictionary are anagrams of "sacre"
anagrams_for('sacre', dictionary)   # => ['acres', 'cares', 'Cesar', 'races']

# Neither the input word nor the words in the dictionary need to be valid English words
anagrams_for('etlsm', dictionary)   # => ['smelt', 'melts', 'etlsm']

anagrams_for('unicorn', dictionary) # => []