in-class questions and answers#18
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MadEste
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Jul 13, 2019
| * **Question:** When does `app.use()` get called? | ||
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| * **Your Answer:** | ||
| * **Your Answer:** It is used to setup every middleware you want to use. It can be called generically or when specific paths are specified. |
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app.use() will always be called once a request reaches that point of the route chain.
MadEste
reviewed
Jul 13, 2019
| * **Question:** What type of thing is `app` and what is its purpose? | ||
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| * **Your Answer:** | ||
| * **Your Answer:** App is an event emitter and function used to start the express server. |
MadEste
reviewed
Jul 13, 2019
| * **Question:** What type of thing is `next` and what does it represent in the callback? | ||
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| * **Your Answer:** | ||
| * **Your Answer:** "next" specifies the next function in the callback. |
MadEste
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Jul 13, 2019
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| * **Question:** Try creating a new vegetable. Then, try restarting your server. What happens to the data you posted and why? | ||
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Data does not persist after sever is restarted since it is not saved to a file or database
MadEste
reviewed
Jul 13, 2019
| * **Question:** Take a look at the last two `app.use()` methods at the end of the file. Describe how both work and what `err` is refers to. | ||
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| * **Your Answer:** | ||
| * **Your Answer:** The last app.use() is a error handler function that acts as a catch-all. |
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Correct, the second to last app.use() will catch any unmatched requests and format an error.
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