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Now we can write tests for our functions and verify that their inputs and outputs adhere to the expected types.

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Finally we can define some terms. These stuff such as type - type are called type operators。官网是该领域的重要参考

我们看书一定是越来越清醒，而不是越来越智障，越来越愤青，我从来没有在比较有读书经验的人身上看到这一点。就我自己的观察，一年多之后，我对一些事情其实是越来越宽容。