Question

I am creating threads in a for loop, and I want to use the for loop’s i as the name for each particular thread. When I run this, instead of getting 1,2 or 2,1, I am getting 2,2. Is there a better/safer way to pass variables into a thread?

ts = []
for i in 1..2 do
  ts.push( Thread.new(i) do
    x = i
    puts x
  end)
end
ts.each do |t|
  t.join()
end

Answer 1

You can pass variable through the block

ts = []

for i in 1..2 do
  ts.push( Thread.new(i) do |i|
    x = i
    puts x
  end)
end

ts.each do |t|
  t.join()
end

# => 1
# => 2