Ruby の thread とクロージャ

gistfile1.txt

require 'thread'

hash = {}

a = Thread.new do
  connection = 'A'

  hash[:a] = -> { puts connection }
end

b = Thread.new do
  connection = 'B'

  hash[:b] = -> { puts connection }
end

a.join
b.join

c = Thread.new do
  connection = 'C'

  hash[:a].call
  hash[:b].call
end

c.join

A
B

と出力される