gistfile1.rb

# can someone please explain this to me?

left = { :a => 'a', :b => 'b' }  # => {:a=>"a", :b=>"b"}
right = { :a => 'a', :b => 'b' } # => {:a=>"a", :b=>"b"}

left == right   # => true
left.eql? right # => false

left_array = [1, 2]
right_array = [1, 2]

left_array == right_array   # => true
left_array.eql? right_array # => true

# which means
[left_array] - [right_array] # => []
[left] - [right] # => [{:a=>"a", :b=>"b"}]