Feature #19002: Explicit splat for enumerator kwarg blocks

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

[inopinatus (Joshua GOODALL)]

I'm renovating some 2.x-era code that relied heavily on autosplat for block kwargs. As we all know, this throws an ArgumentError in Ruby 3:

ary = [
  { foo: 42, bar: 101 },
  { foo: 99, bar: 123 }
]

ary.map { |foo:, bar:| foo+bar } #=> ArgumentError

The nicest solution I could find so far is

module Enumerable
  def splat
    each { |arg| yield **arg }
  end
end

and then

ary.map.splat { |foo:, bar:| foo+bar } #=> [143, 222]

and I present this as a feature suggestion.

[inopinatus (Joshua GOODALL)]

• Description updated (diff)

[inopinatus (Joshua GOODALL)]

• Description updated (diff)

[inopinatus (Joshua GOODALL)]

I also had

module Enumerable
  def **(proc) = each { |arg| proc[**arg] }
end

ary.map ** ->(foo:, bar:) { foo+bar } #=> [143, 222]

which is kinda fun, but not so readable.