相关疑难解决方法(0)

阅读文章http://jeffkreeftmeijer.com/2011/method-chaining-and-lazy-evaluation-in-ruby/后,我开始寻找方法链和懒惰评估的更好解决方案.

我想我已经用以下五个规格封装了核心问题; 谁能让他们全部通过？

一切顺利:子类化,委托,元编程,但对后者不鼓励.

将依赖关系保持在最低限度是有利的:

require 'rspec'

class Foo
    # Epic code here
end

describe Foo do

  it 'should return an array corresponding to the reverse of the method chain' do
    # Why the reverse? So that we're forced to evaluate something
    Foo.bar.baz.should == ['baz', 'bar']
    Foo.baz.bar.should == ['bar', 'baz']
  end

  it 'should be able to chain a new method after initial evaluation' do
    foobar = Foo.bar
    foobar.baz.should == ['baz', 'bar']

    foobaz = Foo.baz
    foobaz.bar.should == ['bar', 'baz'] …