RubyMonk Snippets

gistfile1.txt

Try implementing a method called occurrences that accepts a string argument and uses inject to build a Hash. The keys of this hash should be unique words from that string. The value of those keys should be the number of times this word appears in that string.

def occurrences(str)
  word_hash = Hash.new(0)
  str.scan(/\w+/).inject(word_hash) do | number, word|
     number[word.downcase] += 1
     number
  end
end

Implement a method superclasses inside Object that returns this class hierarchy information? The method has to return an array that
lists the superclasses of the current object.

class Object
  def superclasses(klass = self.superclass)
    return [] if klass.nil?
    [klass] + superclasses(klass.superclass)
  end
end

class Bar
end

class Foo < Bar
end

p Foo.superclasses  # should be [Bar, Object, BasicObject]