Ruby Syntax Explanation

Question

I was reading through the documentation for Enumerator and I ran across this example:

fib = Enumerator.new do |y|
  a = b = 1
  loop do
    y << a
    a, b = b, a + b
  end
end

Everything makes sense to me except for this line: a, b = b, a + b. Could somebody please explain what's happening?

Might help if you mentally add brackets: `(a, b) = [b, a + b]` (that syntax also works) — Neil Slater, Aug 26 '16 at 19:21

score 2 · Answer 1 · edited May 23 '17 at 10:33

2

It's a parallel assignment pattern which you can see in many languages including ruby probably you will find this helpful Parallel Assignment operator in Ruby

edited May 23 '17 at 10:33

Community

1
1

answered Aug 26 '16 at 19:26

Miad Abrin

952
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Ah, I see it now. Thanks! – LandonSchropp Aug 26 '16 at 19:48

Ruby Syntax Explanation

1 Answers1