Advances in Computers, Vol. 22 by Marshall C. Yovits

By Marshall C. Yovits

Seeing that its first quantity in 1960, Advances in desktops has awarded targeted insurance of suggestions in and software program and in computing device idea, layout, and functions. It has additionally supplied participants with a medium within which they could research their topics in higher intensity and breadth than that allowed by means of general magazine articles. therefore, many articles became general references that remain of vital, lasting price regardless of the quick progress happening within the box.

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Node’s built-in url module exposes a few functions, but the big kahuna is a function called parse. It takes a URL string and extracts useful information, like the domain or the path. You’ll use Node’s require function to use the url module. require is similar to keywords like import or include in other languages. require takes the name of a package as a string argument and returns a package. There’s nothing special about the object that’s returned—it’s often an object, but it could be a function or a string or a number.

3 Two requests flowing through middleware functions. Note that middleware sometimes continues on but sometimes responds to requests. com> 36 CHAPTER 3 Foundations of Express Each middleware function can modify the request or the response, but it doesn’t always have to. Eventually, some middleware should respond to the request. It could be the first one; it could be the last. If none of them respond, then the server will hang and the browser will sit alone, without a response. This is powerful because you can split your application into many small parts, rather than having one behemoth.

Let’s build the classic Hello World. js and put the following inside. ". If you’ve ever used the console when writing browser-based JavaScript, this should look familiar. js. ) If everything works well, you should see the text appear on the screen. 1. ” code Using modules Most programming languages have a way of including the code in file A from inside file B so that you can split your code into multiple files. C and C++ have #include; Python has import; Ruby and PHP have require. Some languages like C# do this kind of cross-file communication implicitly at compile time.

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