如何在 ruby 中获取特定的数组索引？

Question

I have an array like this

data = [
  {
    "email"=>"name1@mail.com",
    "id"=>001,
    "name"=>"Name 1"
  },
  {
    "email"=>"name2@mail.com",
    "id"=>002,
    "name"=>"Name 2"
  },
]

and I want to select by name

name = data.select {|x| x[:name] == "Name 1"}

the result is

[
  {
    "email"=>"name1@mail.com",
    "id"=>001,
    "name"=>"Name 1"
  }
]

And I get what I want, but what if I want to just get the id?

I expect results like this: 001

Answer 1

There are different ways to get what you need, depending on the scenario in which you are.

If you need only the id key/value from a single object, you can use find :

data.find { |x| x['name'] == 'Name 1' }['id']
# 1

In the other hand, if you need more than one, and using select you filter them, then you can map the id from every resulting object:

data.select { |x| x['name'] == 'Name 1' }.map { |x| x['id'] }
# [1]