Add Enumerable#index_with.
In the app I'm working on I've wished that index_by had a buddy that would assign the hash value instead of the key multiple times. Enter index_with. Useful when building a hash from a static list of symbols. Before you'd do: ```ruby POST_ATTRIBUTES.map { |attr_name| [ attr_name, public_send(attr_name) ] }.to_h ``` But now that's a little clearer and faster with: ````ruby POST_ATTRIBUTES.index_with { |attr_name| public_send(attr_name) } ``` It's also useful when you have an enumerable that should be converted to a hash, but you don't want to muddle the code up with the overhead that it takes to create that hash. So before, that's: ```ruby WEEKDAYS.each_with_object(Hash.new) do |day, intervals| intervals[day] = [ Interval.all_day ] end ``` And now it's just: ```ruby WEEKDAYS.index_with([ Interval.all_day ]) ``` It's also nice to quickly get a hash with either nil, [], or {} as the value.
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