Feature #9929: add with_default method to Hash

• Status: Open
• Assignee: -
• Target version: -

[dontfidget (Andrew Brown)]

I would like to be able to write this:

people.group_by(:first_name).with_default { [] }

instead of:

hash = people.group_by(:first_name)
hash.default_proc = proc { [] }

or, perhaps:

people.group_by(:first_name).tap { |hash| hash.default_proc = proc { [] } }

Just wondering if anyone else would be interested in a change like this. I posted a pull request in Rails for an ActiveSupport core extension that does the same thing but would love to see it in Ruby proper. (Pull request is at https://github.com/rails/rails/pull/15626)