使用地圖創建一個新的陣列

Question

我有以下陣列

personality_types = ["bad", "good", "great"] 

我想通過personality_types迭代和構建（也輸出吧）這個數組：["bad person", "good person", "great person"]

我已經做了這樣

personality_types = ["bad", "good", "great"] 

personality_types.each do |x| 
    x << ' person' 

end 

puts personality_type 

但我希望能夠使用.map函數來代替它。我怎樣才能使用.map來做到這一點？我一直無法弄清楚。

這是我有什麼，但它不工作（我只得到[「壞」，「好」，「偉大」]我的輸出）：

personality_types = ["bad", "good", "great"] 

personality_types.map { |type| 
    type + " person" 
    } 


puts personality_types 

Answer 1

Array#map返回新陣列。你必須把它賦值給變量：

personality_types = ["bad", "good", "great"] 
personality_types = personality_types.map { |type| "#{type} person" } 

或者使用Array#map!直接改變陣列：

personality_types = ["bad", "good", "great"] 
personality_types.map! { |type| "#{type} person" } 

personality_types 
#=> ["bad person", "good person", "great person"]