Issue #20702 has been updated by matz (Yukihiro Matsumoto). Looks like a good idea. Accepted. Matz. ---------------------------------------- Feature #20702: Add `Array#fetch_values` https://bugs.ruby-lang.org/issues/20702#change-109638 * Author: toy (Ivan Kuchin) * Status: Open ---------------------------------------- `Array` and `Hash` have matching methods to fetch: * One value using `[]` (`Array` also allows fetching multiple with range or two arguments) * One value with default or exception using `fetch` method * Multiple values using `values_at` method But only `Hash` has method `fetch_values` to fetch multiple values with fallback or raising an exception (see #10017). ```ruby hash = {a: 1, b: 2, c: 3} array = [1, 2, 3] hash[:b] # => 2 hash[:d] # => nil array[1] # => 2 array[4] # => nil hash.fetch(:b) # => 2 hash.fetch(:d) # => IndexError hash.fetch(:d){ 42 } # => 42 array.fetch(1) # => 2 array.fetch(4) # => IndexError array.fetch(4){ 42 } # => 42 hash.values_at(:b, :c) # => [2, 3] hash.values_at(:b, :d) # => [2, nil] array.values_at(1, 2) # => [2, 3] array.values_at(1, 4) # => [2, nil] hash.fetch_values(:b, :c) # => [2, 3] hash.fetch_values(:b, :d) # => IndexError hash.fetch_values(:b, :d){ 42 } # => [2, 42] # missing array.fetch_values(1, 2) # => [2, 3] array.fetch_values(1, 4) # => IndexError array.fetch_values(1, 4){ 42 } # => [2, 42] ``` -- https://bugs.ruby-lang.org/