Get a hash where key names match local variable values

hash_for_locals.rb

class Binding
  def hash_for_locals(*keys)
    values = {}
    keys.each do |key|
      values[key] = local_variable_get(key)
    end
    values
  end
end

a = 123
b = "xyz"

binding.hash_for_locals :a, :b

# {:a=>123, :b=>"xyz"}