each vs map usage in ruby

each vs map.rb

json = ActiveSupport::JSON.decode(google)['predictions']

# sort of traditional for() loop style
results = []
json.each do |location|
  results << {
    :short => 'foo',
    :long => 'bar'
  }
end

# functional programming style
# in ruby you never actually need to use the 'return' keyword, 
# in neither a def foobar; ...; end" method or an anonymous block like this 
# the last value is always returned
results = json.map do |location|
  {
    :short => 'foo',
    :long => 'bar'
  }
end

# or also like this
# writing with smaller methods makes it easier to unit test

def short_and_long_from_location(location)
  {
    :short => 'foo',
    :long => 'bar'
  }
end

results = json.map {|loc| short_and_long_from_location(loc) }