JavaScript Demystified (Demystified)

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While not a programming language it's actually a "markup language"—a set of markup symbols and codes , HTML is the foundation for creating web pages and applications. Essentially, it describes how content should be presented on a page. When used in conjunction with CSS the markup language for adding style to web pages , you can not only create a basic website, but design it as well. Learning JavaScript is essential if you hope to enter into web design, development, or other related fields.

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Essentially, JavaScript allows you to make your website interactive. HTML is the noun—the subject that the sentence is all about, CSS is the adjective, dressing up that noun to make it more attractive, and JavaScript is the verb—the interactions and animations on the website. But JavaScript isn't just for front-end developers.

JavaScript is supported by every major browser and is one of the only languages created for both the server back-end and client-side front-end , it's one of the most useful and versatile web development skill sets out there.

Austin JavaScript: Source Maps Demystified

It's not just a recommended language to learn— any experts say it's imperative that you learn it. JavaScript is a crucial part of every modern web developer's language toolkit. The creator of Ruby said he created this programming language as a way to "make programmers happy. Rails—a web application framework designed to work within the Ruby language—was created in order to then make Ruby accessible on the web.

This means that, while you can be fine just knowing the Ruby language, most companies aren't going to hire you to solely write in Ruby—they want you to know Rails as well. If you're still new to the coding world, Ruby on Rails RoR is one of the best languages for beginners to learn as it's a high-level language, rather than low-level languages like C.

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You're dealing with higher levels of abstraction, so you don't have to worry about low-level things like memory allocation, garbage collection, and semicolons. When an error occurs in a promise that does not have an error callback, it will skip over all the following success callbacks until it hits an error callback.

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  • In the example above, if an error were to occur in requestVisit , the following success callbacks would be skipped and the next piece of code to be executed would be the error callback, where we output the error as follows: console. Similar to sequential operations, promises make parallel operations much, much cleaner than with callbacks. For instance, using the Q module, you can use all to turn an array of promises into one promise.

    What Are Promises?

    That code will execute isListingAvailable multiple times in parallel, and the method validateListing will either resolve or reject its promise when all the isListingAvailable calls have completed. That being said, the error callback will get called at the first sign of failure.

    That means that whichever of the promises fails first gets handled by the error callback. I personally think that chaining promises outside of the success callbacks as described in the Sequential Operations section above is the cleanest approach. However, it is important to note that it is possible to nest promises and that in some situations, it is the preferable approach. What I mean by nesting promises is that, from within a success callback, we execute an asynchronous operation and handle the promise result from within that same success callback.

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    Let me demonstrate that by an example:. In this example, if requestVisit was not successful, we want to call markVisitAsFailed and then notify the admin, before continuing on with the regular flow. Using nested promises for such a use case is a good solution in my opinion. I hope this answered some of your questions or concerns regarding Javascript promises, and that it demonstrated how much better everyone's life is when people use promises instead of callbacks.

    Think about future-you that will have to debug your code in a few weeks or months, and please write cleaner code. Designing for Scale. Never miss an article.

    Javascript Demystified

    Join other developers who get early access to new articles and guides. Home If you ever had to write a complex application and I use the word complex very loosely here , you've most likely had to run asynchronous operations. Enter Promises. What Are Promises? Based on this definition, we now understand that a promise can be in three different states: A pending state: the result has not yet been determined and we are waiting for the asynchronous operation to complete. streams demystified · GitHub

    A resolved state: the asynchronous operation completed successfully. A rejected state: something went wrong during the asynchronous operation we will get to the error handling part shortly. Getting Started Promises have a then method that you can use to get the result, which as we learned previously, can either be resolved or rejected.