Javascript alternative for web

Warning: Use of the with statement is not recommended, as it may be the source of confusing bugs and compatibility issues. See the "Ambiguity Contra" paragraph in the "Description" section below for details. Adds the given expression to the scope chain used when evaluating the statement. The parentheses around the expression are required. Any statement. JavaScript looks up an unqualified name by searching a scope chain associated with the execution context of the script or function containing that unqualified name.

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Javascript alternative for web

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Content:

• Dart vs JavaScript: detailed comparison
• How 10 Major Companies Are Using JavaScript
• 4 alternative web browsers that aren’t Google Chrome
• Asynchronous JavaScript
• What Web Frameworks Solve: The Vanilla Alternative (Part 2)
• A different kind of library
• PHP vs JavaScript: How to Choose the Best Language for Your Project
• Firebug Alternatives: 10 Best JavaScript Debugging Tools
• JavaScript best practices

Dart vs JavaScript: detailed comparison

Writing a best practice article is quite a tricky business. To a number of you, what you are about to read will appear to be very obvious and just the sensible thing to do. Take the advice below to heart and keep it in a part of your brain that has a quick access route so you can apply it without thinking about it. I am sure you will find things to disagree with, and that is a good thing - you should question what you read, and strive to find better solutions.

However, I have found that following these principles has made me a more effective developer and allowed other developers to build upon my work more easily. None of these make much sense — good variable and function names should be easy to understand and tell you what is going on — not more and not less. One trap to avoid is marrying values and functionality in names.

A function called isLegalDrinkingAge makes more sense than isOverEighteen as the legal drinking age varies from country to country, and there are other things than drinking to consider that are limited by age.

Hungarian notation is a good variable naming scheme to adopt there are other naming schemes to consider , the advantage being that you know what something is supposed to be and not just what it is.

It is very informative for some, but seems like extra overhead to others — it is really up to you whether you use it or not. Keeping to English is a good idea, too. Programming languages are in English, so why not keep this as a logical step for the rest of your code.

Having spent some time debugging Korean and Slovenian code, I can assure you it is not much fun for a non-native speaker. See your code as a narrative. If you can read line by line and understand what is going on, well done. If you need to use a sketchpad to keep up with the flow of logic, then your code needs some work.

Try reading Dostojewski if you want a comparison to the real world — I got lost on a page with 14 Russian names, 4 of which were pseudonyms.

Don't write code like that — it might make it more art than product, but this is rarely a good thing. Global variables and function names are an incredibly bad idea.

The reason is that every JavaScript file included in the page runs in the same scope. Say you have three functions and a variable like this:. This can get annoying and repetitive. It is easier to wrap the whole thing in an anonymous function and protect the scope that way.

This trick is called the Module Pattern:. Again, this approach is not without issues. None of these are available from the outside at all any more. If you want to make them available you need to wrap the things you want to make public in a return statement:. That pretty much brings us back to square one in terms of linking from one to the other and changing syntax. Instead of returning the properties and methods I just return pointers to them.

This makes it easy to call functions and access variables from other places without having to go through the myNameSpace name.

It also means that you can have a public alias for a function in case you want to give it a longer, descriptive name for internal linking but a shorter one for the outside:. This keeps everything in a tidy little package that is inaccessible to the outside world, but very easy to share variables and functions inside of.

Browsers are very forgiving when it comes to JavaScript syntax. This should not however be a reason for you to write sloppy code that relies on browsers to make it work. The easiest way to check the syntactical quality of your code is to run it through JSLint — a JavaScript validation tool that gives you a detailed report about the syntax warnings and their meaning. People have been writing extensions for editors for example the JS Tools for TextMate that automatically lint your code when you save it.

JSLint can be a bit touchy about the results it returns and — as its developer Douglas Crockford says — it can hurt your feelings. Clean and valid code means less confusing bugs to fix, easier handover to other developers and better code security. When you rely on hacks to get your code to work it is likely that there is also a security exploit that uses the same hacks.

In addition, as hacks get fixed in browsers, your code will cease to work in the next version of the browser.

Valid code also means that it can be converted by scripts to other formats — hacky code will need a human to do that. Comments are your messages to other developers and yourself, if you come back to your code after several months working on something else. What I see as a flaw in this argument is that explanations are a very subjective thing — you cannot expect every developer to understand what some code is doing from exactly the same explanation.

Again the trick is moderation. If you comment out parts of your code to be used at a later stage or to debug code there is a pretty sweet trick you can do:. Adding a double slash before the closing star-slash sets your code up so that you can comment and uncomment the whole block by simply adding or removing a slash before the opening slash-star:.

Removing the slash will comment it out again. For larger applications comment documentation in JavaDoc style makes a lot of sense — you are seeding the overall documentation of your product by writing code. The Yahoo User Interface library's success is partly attributable to this, and there is even a tool you can use to build the same documentation for your products. Whilst it is possible to create everything you need in a document using JavaScript and the DOM it is not necessarily the most effective way of doing so.

This works, however it means that if you later need to make a change to these styles you need to go through the JavaScript and apply the changes there. Furthermore, not every JavaScript developer is proficient or interested in CSS, which means there will be a lot of back and forth until the outcome is reached. This is much more efficient as CSS was meant to cascade through the document. Say for example you want to hide all DIVs with a certain class in a document.

You could loop through all the DIVs, check their classes and then change their style collection. In newer browsers you could use a CSS selector engine and then alter the style collection.

The easiest way however is to use JavaScript to set a class on a parent element and use syntax along the lines of element. Shortcut notation is a tricky subject: on the one hand it keeps your code small but on the other you might make it hard for developers that take over from you as they might not be aware of the shortcuts. Objects are probably the most versatile thing you have in JavaScript. The old-school way of writing them is doing something like this:.

However, this means you need to repeat the object name for each property or method, which can be annoying. Instead it makes much more sense to have the following construct, also called an object literal:. Arrays are a confusing point in JavaScript. This is a lot of useless repetition; this can be written a lot more quickly using the [ ] array shortcut:.

This is a misnomer as arrays with named properties rather than an index are actually objects and should be defined as such. For example, the following construct defines a variable as 1 or -1, depending on the value of another variable:.

Anything before the question mark is the condition, the value immediately after it is the true case and the one after the colon the false case. Another common situation in JavaScript is providing a preset value for a variable if it is not defined, like so:. This will automatically give x a value of 10 if v is not defined — simple as that. This is a general programming best practice — making sure that you create functions that fulfill one job at a time makes it easy for other developers to debug and change your code without having to scan through all the code to work out what code block performs what function.

This also applies to creating helper functions for common tasks. If you find yourself doing the same thing in several different functions then it is a good idea to create a more generic helper function instead, and reuse that functionality where it is needed. Also, one way in and one way out makes more sense than forking the code in the function itself. Say you wanted to write a helper function to create new links. You could do it like this:.

This works ok, but you might find yourself having to add different attributes depending on which elements you apply the link to. For example:. This makes the function more specific and harder to apply to different situations.

A cleaner way is to return the link and cover the extra cases in the main functions that need them. This turns addLink into the more generic createLink :. By having all your functions only perform one task you can have a main init function for your application that contains all the application structure.

That way you can easily change the application and remove functionality without having to scan the rest of the document for dependencies. Progressive Enhancement as a development practice is discussed in detail in the Graceful degradation versus progressive enhancement. In essence what you should do is write code that works regardless of available technology. It is amazing how many times you will build a massively convoluted JavaScript solution for a problem that can be solved easily without it.

One example I encountered was a search box on a page that allowed you to search different data: the web, images, news and so on. In the original version the different data options were links that would re-write the action attribute of the form to point to different scripts on the back end to perform the searches. The problem was that if JavaScript was turned off the links would still show up but every search would return standard web results as the action of the form never got changed.

The solution was very simple: instead of links we provided the options as a radio button group and did the forking to the different specialist search scripts using a back end script. This not only made the search work correctly for everybody, it also made it easy to track how many users chose which option.

By using the correct HTML construct we managed to get rid of both the JavaScript to switch the form action and the click tracking scripts and made it work for every user out there — regardless of environment. One of the most successful tips to keep your code maintainable and clean is to create a configuration object that contains all the things that are likely to change over time. These include any text used in elements you create including button values and alternative text for images , CSS class and ID names and general parameters of the interface you build.

For example the Easy YouTube player has the following configuration object:. If you have this as a part of a module pattern and make it public you even allow implementers to only override what they need before initializing your module.

It is of utmost importance to keep code maintenance simple, avoiding the need for future maintainers having to read all your code and find where they need to change things. Nesting code explains its logic and makes it much easier to read, however nesting it too far can also make it hard to follow what you are trying to do.

The other problem of nesting is variable names and loops. This can become messy quite quickly:.

How 10 Major Companies Are Using JavaScript

Whenever JavaScript-enabled content or interactions cannot be made directly accessible, an accessible alternative must be provided. There are several ways you can provide accessible alternatives when the scripting cannot be made accessible or when the end user does not have JavaScript enabled. In many cases, the functionality provided by JavaScript can or should be duplicated by server-side scripting. For example, JavaScript is often used to validate form elements before a form is posted. Instead of or in addition to implementing such JavaScript programming and its accompanying accessibility techniques, you could use a server-side script to validate the form elements. Because scripting can always be disabled or modified by the end user, it should never be relied on for critical form validation or other functions. Again, using a server script negates the need for additional accessibility implementation.

4 alternative web browsers that aren’t Google Chrome

However, for users with special requirements, Firebase provides alternative ways to add the SDK. This page provides detailed setup instructions for these alternative methods:. Using these methods, you can add any of the available libraries for version 9 to your app. If you don't already have a package. Install the firebase npm package and save it to your package. You can require modules from any JavaScript file. To include only specific Firebase products like Authentication and Cloud Firestore :.

Asynchronous JavaScript

It includes everything you need to build rich UIs that work on any device. Some of the best development teams in the world have been iterating on their products for years with Ember. With scalable UI architecture baked-in from the start, you'll be working with the same patterns these organizations use every step of the way. Benefit from our years of experience to help your team be productive—faster. You'll never have to wire together your own framework ever again!

What Web Frameworks Solve: The Vanilla Alternative (Part 2)

Yew is a modern Rust framework for creating multi-threaded front-end web apps using WebAssembly. Click the link below to learn how to build your first Yew app and learn from community-built example projects. This project is built on cutting edge technology and is great for developers who like to develop the foundational projects of tomorrow. We think that the speed and reliability of the technologies on which Yew is built are set to become the standard for fast and resilient web applications of the future. WebAssembly Wasm is a portable low-level language that Rust can compile to. It runs at native speeds in the browser and is interoperable with JavaScript and supported in all major modern browsers.

A different kind of library

We're a place where coders share, stay up-to-date and grow their careers. We're about to launch a major overhaul of Imba , the programming language we use for everything here at Scrimba. Imba is not an academic exercise or a toy project. Since we've been flying under the radar for several years I thought I should post about it here now that we are approaching beta of this major update. Imba's syntax is minimal, beautiful, and packed with clever features. It combines logic, markup and styling in a powerful way. Less keystrokes, and less switching files means you'll be able to build things fast.

PHP vs JavaScript: How to Choose the Best Language for Your Project

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Firebug Alternatives: 10 Best JavaScript Debugging Tools

JavaScript often shortened to JS is a lightweight, interpreted, object-oriented language with first-class functions , and is best known as the scripting language for Web pages, but it's used in many non-browser environments as well. It is a prototype-based , multi-paradigm scripting language that is dynamic, and supports object-oriented, imperative, and functional programming styles. JavaScript is an easy to learn and also powerful scripting language, widely used for controlling web page behavior. Contrary to popular misconception, JavaScript is not "Interpreted Java". In a nutshell, JavaScript is a dynamic scripting language supporting prototype based object construction.

JavaScript best practices

Overview of alternative open source front-ends for popular internet platforms e. YouTube, Twitter, etc. Invidious : Invidious is an alternative front-end to YouTube - Lightweight, no ads, no tracking, no JavaScript required. Piped : An alternative privacy-friendly YouTube frontend which is efficient by design - Lightweight, no ads, no tracking. CloudTube : Alternative front-end for Invidious. Invuedious : An alternative frontend for invidious built with vue. Youtube-viewer : Lightweight YouTube client for Linux.

Writing a best practice article is quite a tricky business. To a number of you, what you are about to read will appear to be very obvious and just the sensible thing to do. Take the advice below to heart and keep it in a part of your brain that has a quick access route so you can apply it without thinking about it. I am sure you will find things to disagree with, and that is a good thing - you should question what you read, and strive to find better solutions.