回忆一下，我们编写了3块代码：任务代码、加载器和聚合器。

As you'll recall, there were 3 pieces of code to write: task code, a loader, and an aggregator.

youdao

接下来我甚至会进一步运行测试用例，尽管我知道它们将失败，因为我没有为该类编写任务代码。

Then I would even take it a step further and run the test cases, even though I know they will fail because I haven't actually written any of the code for it.

youdao

清单2展示了这项任务的代码。

Listing 2 shows the code for the task.

youdao

So my challenge to you, and I know Professor Guttag can do this, my challenge to you is, a year from now, come back and look at code you wrote here.

因此我这里有个具有挑战性的任务，我知道Guttag也可能会说这个任务，我的这个任务就是，一年以后，回头来看,你之前写过的代码。

麻省理工公开课 - 计算机科学及编程导论课程节选