同じ配列の最初の文字列に2番目の文字列を追加するにはどうすればいいですか？

Question

都市と州の配列があります。このようなものになります。

locations = ["Colorado Springs, CO","CO","Denver, CO","CO","Kissimmee, FL","FL","Orlando, FL", "FL"] 

私がテストにこれをした：

locations[0] << ", #{locations[1]}" 

、結果としてこれを得た：

locations = ["Colorado Springs","CO","Denver","CO","Kissimmee","FL","Orlando", "FL"] 

は私が最終的にこの結果を取得したいと思います

locations = ["Colorado Springs, CO", "CO", "Denver", "CO", "Kissimmee", "FL", "Orlando", "FL"] 

私は以下のコードを試しています

locations = ["Colorado Springs","CO","Denver","CO","Kissimmee","FL","Orlando", "FL"] 

counter0 = 0 
counter1 = 1 

while counter0 < locations.length 
    locations[counter0] << locations[counter1] 
    counter0 += 2 
    counter1 += 2 
end 

=> nil 

Answer 1

locations.each_slice(2).flat_map { |city, state| ["#{city}, #{state}", state] } 
    #=> ["Colorado Springs, CO", "CO", "Denver, CO", "CO", 
    # "Kissimmee, FL", "FL", "Orlando, FL", "FL"] 

Answer 2

キーがflat_mapを使用することです：配列の残りの部分を変換するが、応答としてnilを取得するためにワット

locations.each_slice(2).flat_map{|x, y| [[x, y].join(", "), y]} 
# => ["Colorado Springs, CO", "CO", "Denver, CO", "CO", "Kissimmee, FL", "FL", "Orlando, FL", "FL"]