Retrieve specific values from hashes within an array ruby rails

Question

Noob question here!

I have an array with hashes that looks like this:

arr = [{id: 1, name: "Pedro"},{id: 2, name: "Pablo"}]

and want to have an array like this:

ids = [1,2]

I looked into using map or select like this:

ids = arr.each.select{|k,v| "id"==k}

But I can't figure it out.

Answer 1

请尝试以下方法：

ids = arr.map { |x| x[:id] }