Download PDF by Basarat Syed: Beginning Node.js

By Basarat Syed

ISBN-10: 1484201876

ISBN-13: 9781484201879

ISBN-10: 1484201884

ISBN-13: 9781484201886

Beginning Node.js is your step by step advisor to studying all of the elements of making maintainable Node.js purposes. you will discover how Node.js is concentrated on developing high-performing, highly-scalable web pages, and the way effortless it's to start. Many front-end devs on a regular basis paintings with HTML, CSS, personal home page, even WordPress, yet have not but bought began with Node.js. This e-book explains every thing for you from a newbie point, allowing you to begin utilizing Node.js on your initiatives correct away.

Using this e-book you'll examine vital Node.js options for server-side programming. you'll commence with an easy-to-follow natural JavaScript primer, you could bypass in case you are convinced of your JS abilities. you are going to then delve into Node.js innovations resembling streams and occasions, and the know-how interested by development full-stack Node.js purposes. you will additionally try your Node.js code, and installation your Node.js functions at the internet.

Node.js is a smart and easy platform to paintings with. it's light-weight, effortless to set up and deal with. you will see that how utilizing Node.js could be a enjoyable and lucrative event - commence at the present time with Beginning Node.js.

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Example text

Js. Listing 3-9 demonstrates this process with a simple example in which we export an object. js, as shown in Listing 3-10. js, as shown in Listing 3-11. This allows you to share in-memory objects between modules that are useful for things like using modules for configuration. A sample execution is shown in Listing 3-12. Listing 3-9. exports = { something: 123 }; Listing 3-10. /bar'); Listing 3-11. something); // 456 Listing 3-12. js process. If you want some form of new object creation mechanism for each require function call, you can export a function from the source module that returns a new object.

Let’s look at the ramifications of this design. js Is Safe Modules in many programming environments are not safe and pollute the global scope. A simple example of this is PHP. php that simply defines a function foo, as shown in Listing 3-3. Listing 3-3. php. This allows you to use the function foo, as shown in Listing 3-4. Listing 3-4. php'); foo(); This design has quite a few negative implications. For example, what a variable foo means in a current file may change based on what you import. As a result, you cannot safely include two files, foo1 and foo2, if there is a chance that they have some variable with the same name.

You can access the util module using a require('util') call. log function, as shown in Listing 3-42. Listing 3-42. format function. This function is similar to the C/C++ printf function. The first argument is a string that contains zero or more placeholders. Each placeholder is then replaced using the remaining arguments based on the meaning of the placeholder. Popular placeholders are %s (used for strings) and %d (used for numbers). These are demonstrated in Listing 3-43. Listing 3-43. format('%s has %d dollars', name, money)); Additionally, util has a few functions to check if something is of a particular type (isArray, isDate, isError).

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Beginning Node.js by Basarat Syed

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