From: konstantin@... Date: 2018-03-07T16:21:34+00:00 Subject: [ruby-core:85976] [Ruby trunk Feature#14580] Hash#store accepts a block Issue #14580 has been updated by Soilent (Konstantin x). Hi Robert, Thank you for your reply. You understood everything correctly. Also, I might be wrong, but it seems to me that in the following case ~~~ruby hash[:a] = hash[:a] + 42 ~~~ Ruby VM will look up the key twice. The proposed method should eliminate the second lookup in this case. ---------------------------------------- Feature #14580: Hash#store accepts a block https://bugs.ruby-lang.org/issues/14580#change-70843 * Author: Soilent (Konstantin x) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- Given a hash ~~~ ruby hash = { a: 2 } ~~~ I want to update a single value in the hash: ~~~ ruby hash[:a] = hash[:a] + 42 hash[:a] #=> 44 ~~~ But instead, I would like to have a method that yields the current value for a given key and associates the block result with the key (similar to Hash#update). I think that Hash#store can be extended to support a block arg. ~~~ ruby hash.store(:a) { |val| val + 42 } hash[:a] #=> 44 ~~~ Or it can be something like this: ~~~ ruby hash.transform_values(:a, :b) { |val| val + 42 } hash[:a] #=> 44 ~~~ -- https://bugs.ruby-lang.org/ Unsubscribe: