[ruby-core:72353] [Ruby trunk - Feature #11797] [Open] `Enumerator#with_object` with multiple objects

[Joseph Jones <joeyi5216@gmail.com>]

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Joseph Jones liked your message with Boxer. On December 9, 2015 at 09:15:54 MST, sawadatsuyoshi@gmail.com wrote:Issue #11797 has been reported by Tsuyoshi Sawada.----------------------------------------Feature #11797: `Enumerator#with_object` with multiple objectshttps://bugs.ruby-lang.org/issues/11797* Author: Tsuyoshi Sawada* Status: Open* Priority: Normal* Assignee: ----------------------------------------Sometimes, when working with `Enumerator#with_object`, I want to keep some additional temporary objects besides the one to return. A use case is as follows (I got this from this StackOverflow question: http://stackoverflow.com/questions/3418123). Suppose I have an enumerator created from an array: e = ["a", "b", "c", "c", "a", "c"].to_enumand want to get an array of its repeated elements in the order they are repeated (i.e., appears for the second time): # => ["c", "a"]I can do it using `Enumerator#with_object` like this: e.to_enum.with_object([{}, []]){|c, (h, a)| h[c] ? a.push(c) : h.store(c, true)}.last.uniqHere, I am getting the array referred to as `a` in the block, but besides that, I am using a temporal hash `h`. I thought it would be nice if `Enumerator#with_object` accepts one or more objects, pass them individually as block arguments, and returns only the last argument so that I can do this: e.to_enum.with_object({}, []){|c, h, a| h[c] ? a.push(c) : h.store(c, true)}.uniq-- https://bugs.ruby-lang.org/     

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