yaml: 配列と hash の cheat sheet

code

cheet_sheet.rb

require 'yaml'

array_of_string = ['a', 'b', 'c']
array_of_array = [
                  ['a1', 'a2'],
                  ['b1', 'b2'],
                  ['c1', 'c2'],
                 ]
array_of_hash = [
                 {'k1' => 'v1'},
                 {'k2' => 'v2'},
                 {'k3' => 'v3'},
                ]
hash_of_string_to_string = {
  'k1' => 'v1',
  'k2' => 'v2',
  'k3' => 'v3',
}
hash_of_string_to_array = {
  'k1' => [ 'a1', 'a2' ],
  'k2' => [ 'b1', 'b2' ],
  'k3' => [ 'c1', 'c2' ],
}
hash_of_string_to_hash = {
  'k1' => { 
    'K11' => 'V11',
    'K12' => 'V12' 
  },
  'k2' => {
    'K21' => 'V21',
    'K22' => 'V22',
  },
  'k3' => {
    'K31' => 'V31',
    'K32' => 'V32',
  },
}
puts 'array_of_string'
puts YAML.dump(array_of_string)
puts
puts 'array_of_array'
puts YAML.dump(array_of_array)
puts
puts 'array_of_hash'
puts YAML.dump(array_of_hash)
puts
puts 'hash_of_string_to_string'
puts YAML.dump(hash_of_string_to_string)
puts
puts 'hash_of_string_to_array'
puts YAML.dump(hash_of_string_to_array)
puts
puts 'hash_of_string_to_hash'
puts YAML.dump(hash_of_string_to_hash)

実行結果

array_of_string
---
- a
- b
- c

array_of_array
---
- - a1
  - a2
- - b1
  - b2
- - c1
  - c2

array_of_hash
---
- k1: v1
- k2: v2
- k3: v3

hash_of_string_to_string
---
k1: v1
k2: v2
k3: v3

hash_of_string_to_array
---
k1:
- a1
- a2
k2:
- b1
- b2
k3:
- c1
- c2

hash_of_string_to_hash
---
k1:
  K11: V11
  K12: V12
k2:
  K21: V21
  K22: V22
k3:
  K31: V31
  K32: V32