From: zverok.offline@... Date: 2019-10-23T07:33:21+00:00 Subject: [ruby-core:95493] [Ruby master Feature#16261] Enumerable#each_tuple Issue #16261 has been updated by zverok (Victor Shepelev). @duerst > What you want to do here is in many other languages done with `zip_with` I used `zip` only as a simplest way to construct an example. In our current codebase we have a fare share of internal methods defined with two pairs of braces, like `def similar?((word1, word2))`, because this allows us, for example, to say things like (imagine calculating some diffs): ```ruby diff_pairs.reject(&method(:similar?)).select(&method(:same_paragraph?)).map(&method(:calculate_closeness)) ``` In other places, we are still just rely on `map { |foo, bar, baz|`, `select` and so on. A very small amount of initial data of such chains is produced with `zip`, but even when it is, `zip_with` can't help with select/reject/group_by and other Enumerable methods. ---------------------------------------- Feature #16261: Enumerable#each_tuple https://bugs.ruby-lang.org/issues/16261#change-82264 * Author: zverok (Victor Shepelev) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- New method proposal. Prototype code: ```ruby module Enumerable def each_tuple return to_enum(__method__) unless block_given? each { |item| yield(*item) } # unpacking possible array into several args end end ``` Supposed documentation/explanation: > For enumerable with Array items, passes all items in the block provided as a separate arguments. t could be useful if the provided block has lambda semantics, e.g. doesn't unpack arguments automatically. For example: ```ruby files = ["README.md", "LICENSE.txt", "Contributing.md"] content = [fetch_readme, fetch_license, fetch_contributing] # somehow make a content for the files files.zip(content).each_tuple(&File.:write) # writes to each file its content ``` > When no block passed, returns enumerator of the tuples: ```ruby [1, 2, 3].zip([4, 5, 6]).each_tuple.map(&:+) # => [5, 7, 9] ``` -- https://bugs.ruby-lang.org/ Unsubscribe: