练习的代码应该被丢弃，这样，他们就能无拘无束地尝试和试验一些事情，不管怎么样，他们不用在基础代码库上面进行练习。
Practice should be on throw-away code so they’re free to try and experiment with things that they otherwise wouldn’t do in their shipping code base.
练习的代码应该被丢弃，这样，他们就能无拘无束地尝试和试验一些事情，不管怎么样，他们不用在基础代码库上面进行练习。
Practice should be on throw-away code so they're free to try and experiment with things that they otherwise wouldn't do in their shipping code base.
在学习完上述资源后，你应该已经尝试了一些代码样本：修改代码、整合代码看看会怎么样。
As you worked through the resources above, you should have been following along with the code samples: pulling them apart, and tweaking them to see what happens.
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