block and arguments decomposition

gistfile1.txt

puts a.uniq.
       map { | e | [a.count(e), e] }.
       select { | c, _ | c > 1 }.
       sort.reverse.
       map { | c, e | "#{e}:#{c}" }






09:51 Lewix: >> [[1, "a"], [1, "d"], [3, "c"], [2, "b"]].select { |c, _| c > 1}
09:51 eval-in: Lewix => [[3, "c"], [2, "b"]] (https://eval.in/91745)
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09:51 hopkins83: Hey Lewix :)
09:51 MrZYX: that's two parameters in the block passed to select
09:52 MrZYX: and what you see here is array decomposition at work
09:52 Lewix: MrZYX: sorry that's what I meant
09:52 MrZYX: it's basically the same as a, b = ["a", "b"]
09:52 Lewix: hopkins83: hello there
09:52 hopkins83: Lewix: Thanks for last time!
09:52 hopkins83: Lewix: I remember you helped me with some stuff a while back.
09:52 MrZYX: select iterates over the outer array, passing each inner array to the block
09:53 MrZYX: that decomposes the two element arrays, writing the first element into c and ignoring the second one (calling a variable _ says I don't care about it)
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09:54 MrZYX: so it's a feature of how blocks work, not how select works
09:54 Lewix: MrZYX: beautiful explanation
09:54 Lewix: hopkins83: anytime
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09:55 Lewix: MrZYX: thanks
09:55 MrZYX: yw