Collect values from an array of hashes [closed]

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Closed 6 years ago.

I have a data structure in the following format:

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

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

回答1:

First, if you are using ruby < 1.9:

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

Then to get what you need:

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

来源：https://stackoverflow.com/questions/18899868/collect-values-from-an-array-of-hashes