Array#to_proc # [ { name: "A" }, { name: "B" } ].map(&[:name]) # => [ "A", "B" ]

README.md

INSTALLATION

echo "gem 'array_to_proc', git: 'git://gist.github.com/bf95dedd5a2a6046ada7.git'" >> Gemfile

or

git clone git@gist.github.com:/bf95dedd5a2a6046ada7.git
gem build array_to_proc.gemspec
gem install --local array_to_proc-0.0.1.gem

EXAMPLE OF USAGE

irb -r array_to_proc

[ { name: "A" }, { name: "B" } ].map(&[:name]) # => [ "A", "B" ]

array_to_proc.gemspec

Gem::Specification.new do |s|
  s.name         = 'array_to_proc'
  s.version      = '0.0.1'
  s.platform     = Gem::Platform::RUBY
  s.author       = '@ipoval'
  s.email        = 'ipoval@ya.ru'
  s.summary      = '[ { name: "A" }, { name: "B" } ].map(&[:name]) # => [ "A", "B" ]'
  s.description  = '[ { name: "A" }, { name: "B" } ].map(&[:name]) # => [ "A", "B" ]'
  s.files        = ['array_to_proc.rb']
  s.require_path = '.'
end

array_to_proc.rb

# [ { name: "A" }, { name: "B" } ].map(&[:name]) # => [ "A", "B" ]
class Array
  def to_proc
    ->(h) { length == 1 ? h[first] : h.values_at(*self) }
  end
end