An implementation of destruct without using eval or #binding

gistfile1.rb

def assert( bool, msg )
  puts (bool ? "Pass " : "Fail ") + msg
end

class Hash
  def destruct( &block )
    vals = block.parameters.map { |p| self[p[1]] }
    block.call(*vals)
  end
end

foo = nil
hash = {foo: 1, bar: 2}

hash.destruct do |foo|
  assert( foo == 1, "inside destruct" )
end

assert foo.nil?, "outside destruct"