Competitors or Siblings – Will WebAssembly Replace JavaScript?
WebAssembly or Wasm is a portable binary code instruction format introduced in the year 2015. It enables the compilation of high-level programming languages like Java, Python, C, and C++.
A web developer writes the code in any of these programming languages and then it is to be run on the web. This task is supported by WebAssembly. WebAssembly does the task of compiling the code into a bytecode that can run in the web browser. This code is then converted into the native machine code and thus finally executed.
Is WebAssembly a Programming Language?
No! WebAssembly has a binary format, which is not human-readable. So, you don’t write in Wasm. You use WebAssembly to compile the web app codes written in applicable programming languages.
The role of Wasm is to aid in the deployment of code in web or server apps; compiling and resulting in fast loading and execution of web apps.
WebAssembly Vs. JavaScript
While you cannot use WebAssembly to write code, JS or JavaScript is a programming or a scripting language. WebAssembly may thus be used in collaboration with JavaScript too.
Even with so many advantages to offer, it would not be reasonable to compare WebAssembly with JavaScript. JS still has some positives over WebAssembly.
JavaScript is a client-side language, which has already established a great authority as the preferred scripting language. It is platform-independent, event-based, dynamically typed, flexible. It is written in human-readable code; while, WebAssembly is less readable than JS, the former being in binary format.
Debugging is a bit difficult in WebAssembly compared to JavaScript, as JavaScript runs directly while Wasm has an extra layer making it complex.
JavaScript is a very old and widely used language. So, the developers can find huge community support for developing complex applications using JavaScript. This is also a major reason why JS is not replaceable, at present.
How WebAssembly Will Change the Way You Develop Web Apps?
Nevertheless, JS has its own place, but WebAssembly for sure has some extra perks to offer. Let’s see how!
#1. Compatible with All Major Operating Systems and Web Browsers
Portability is the major trait of Wasm. It ensures efficient execution on a wide range of operating systems. With just one compilation step, it will make the app run on any of the modern browsers.
#2. Offers Programming Language Choice to Developers.
WebAssembly allows developers to write in their language of choice, which it then compiles into Wasm bytecode which is run on the client web browser, translated into native machine code, and executed at high speed.
Wasm serves as a good compilation tool supporting many popular languages for the web. So, the developers can enjoy the freedom to choose the language for coding.
#3. Provides Better Load Time to Web Apps
WebAssembly is in binary format; files are smaller in size due to this format. Because its binaries are lighter than the textual JS files, WebAssembly is faster to decode.
On the contrary, JavaScript converts the text into AST (abstract syntax tree) first and then convert AST into binary format. This increases the loading time of web apps significantly, which can be reduced with the use of WebAssembly.
Optimization, in WebAssembly, is done only once on the server-side instead of various times on the client-side. It is thus faster to load, parse, and execute. This reduces the loading time of the application.
WebAssembly, due to its easy-to-load capabilities, is especially useful in heavy applications such as games.
#4. Ensures Secure Experience to Users
Modules in WebAssembly execute in a sandboxed environment, which isolates the untested code (using fault isolation techniques). This offers users protection from malicious modules. WebAssembly enforces the permissions security policies of the browser.
Where Should You Use WebAssembly?
Taking into consideration the pros of WebAssembly, its ideal use cases are heavy applications where faster load time is a major requirement. So, Wasm has a great scope in gaming, video editing, and music streaming.
Businesses that were majorly using desktop apps earlier are now in need of web apps. WebAssembly can be used to port your desktop app to the web.
With WebAssembly, for running your app in any browser, it requires only one step that is, compilation. Consequently, it runs at near-native speed. Due to this, one more significant area where WebAssembly can be leveraged the most is CAD applications.
Where high-performance code is to be written from scratch, JS is not a suitable choice. Also, if the high-performance code already exists in a language like C++ or Python, WebAssembly module can be used for compiling.
Wrapping Up!
“Alone we can do so little; together we can do so much.” “ Helen Keller
This popular quote holds wonderfully true for the relationship between WebAssembly and JavaScript.
WebAssembly can be termed as a high-potential JS feature and not a comparison to JavaScript. Wasm indeed can potentially reduce the monopoly of JS, but it is still not a replacement. Due to its enormous advantages, WebAssemtbly when used with popular web app programming languages like C++, would definitely offer a tough competition to JavaScript, if not replace it.
Wasm runs parallel to HTML, CSS, and JavaScript in the browser. The WebAssembly module is loaded in using JavaScript APIs.
Moreover, WebAssembly when used in collaboration with JavaScript, will instead enhance the scopes of JavaScript by eliminating some of the limitations of JavaScript and imparting its benefits to JS. JavaScript and WebAssembly perfectly complement each other and their union will open new doors in high-performance web app development.
Developers have their preferred languages, and the choice of language can vary with your project requirements. I have described why WebAssembly, though an emerging trend, is not yet all set to replace JavaScript.
If you know any benefits of WebAssembly that can make it the future of web app development, don’t forget to share here in the comments section!
