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Programming Elixir 1.2 by Dave Thomas

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Process Overhead

At the start of the chapter, I somewhat cavalierly said Elixir processes were very low overhead. Now it is time to back that up. Let’s write some code that creates n processes. The first will send a number to the second. It will increment that number and pass it to the third. This will continue until we get to the last process, which will pass the number back to the top level.

1: defmodule​ Chain ​do
def​ counter(next_pid) ​do
receive​ ​do
n ->
5:  send next_pid, n + 1
end
end
def​ create_processes(n) ​do
10:  last = Enum.reduce 1..n, self,
fn​ (_,send_to) ->
spawn(Chain, ​:counter​, [send_to])
end
15:  send last, 0 ​# start the count by sending a zero to the last ...

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