Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/full_join/core_ext/array/full_join.rb

Overview

extension original class

Instance Method Summary collapse

Instance Method Details

#full_join(other, &block) ⇒ Array

Returns a new array full joined other.

Examples:

Hoge = Struct.new(:id, keyword_init: true)
array1 = [Hoge.new(id: 1), Hoge.new(id: 2), Hoge.new(id: 3)]
array2 = [Hoge.new(id: 2), Hoge.new(id: 3), Hoge.new(id: 4)]
array1.full_join(array2) #=> [
  [#<struct Hoge id=1>, nil]
  [#<struct Hoge id=2>, #<struct Hoge id=2>]
  [#<struct Hoge id=3>, #<struct Hoge id=3>]
  [nil, #<struct Hoge id=4>]
]
Hoge = Struct.new(:id, :name, keyword_init: true)
Fuga = Struct.new(:id, :name, keyword_init: true)
array1 = [
  Hoge.new(id: 1, name: "AAA"),
  Hoge.new(id: 2, name: "BBB"),
  Hoge.new(id: 3, name: "CCC")
]
array2 = [
  Fuga.new(id: 101, name: "BBB"),
  Fuga.new(id: 102, name: "CCC"),
  Fuga.new(id: 103, name: "DDD")
]
array1.full_join(array2, &:name) #=> [
  [Hoge.new(id: 1, name: "AAA"), nil],
  [Hoge.new(id: 2, name: "BBB"), Fuga.new(id: 101, name: "BBB")],
  [Hoge.new(id: 3, name: "CCC"), Fuga.new(id: 102, name: "CCC")],
  [nil, Fuga.new(id: 103, name: "DDD")]
]

Returns:

  • (Array) —

    a new array full joined other.



38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
 
# File 'lib/full_join/core_ext/array/full_join.rb', line 38

def full_join(other, &block)
  block = ->(s) { s } unless block_given?

  results = each_with_object([]) do |obj1, arr|
    found = false
    other.each do |obj2|
      next unless block.call(obj1) == block.call(obj2)

      arr << [obj1, obj2]
      found = true
      break
    end
    arr << [obj1, nil] unless found
  end

  results.concat((other - results.map(&:last)).zip([]).map(&:reverse))
end