each_with_object instead of inject

gistfile1.rb

# replace this
%w(foo bar).inject({}) { |hsh, str| hsh[str] = str.upcase; hsh }

# with this. note that memo is second here
%w(foo bar).each_with_object({}) { |str, hsh| hsh[str] = str.upcase }
# => {'foo' => 'FOO', 'bar' => 'BAR'}