ruby 从散列数组中收集值

Collect values from an array of hashes

提问by Kert

I have a data structure in the following format:

我有以下格式的数据结构：

data_hash = [
    { price: 1, count: 3 },
    { price: 2, count: 3 },
    { price: 3, count: 3 }
  ]

Is there an efficient way to get the values of :priceas an array like [1,2,3]?

有没有一种有效的方法来获取:price像这样的数组的值[1,2,3]？

回答by Zabba

First, if you are using ruby < 1.9:

首先，如果您使用 ruby​​ < 1.9：

array = [
    {:price => 1, :count => 3},
    {:price => 2, :count => 3},
    {:price => 3, :count => 3}
]

Then to get what you need:

然后得到你需要的东西：

array.map{|x| x[:price]}