Collect values from an array of hashes

Question

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]?

Solution

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]}

Comments

[PJP]

The updated syntax for the "hash" is correct, but at that point data_hash is a misnomer. The OP should use data_hashes or data_array, either of which would be better.

[Zabba]

Oops, you are right. Corrected.