使用地图创建一个新的阵列

Question

我有以下阵列

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

我想通过personality_types迭代和构建（也输出吧）这个数组：["bad person", "good person", "great person"]

我已经做了这样

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

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

end 

puts personality_type 

但我希望能够使用.map函数来代替它。我怎样才能使用.map来做到这一点？我一直无法弄清楚。

这是我有什么，但它不工作（我只得到[“坏”，“好”，“伟大”]我的输出）：

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

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


puts personality_types 

Answer 1

Array#map返回新阵列。你必须把它赋值给变量：

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

或者使用Array#map!直接改变阵列：

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

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