A web assembly is mainly a binary format for the web. It is all about making the web faster than ever. Many major vendors are collaborating with the same to design and implement this format on the web. The main aim is to improve the web performance by making advancements in the design of binary formats. Tool chains and compilers are the major components which are needed for the web assembly along with a proper browser which can implement the output. This format was created by Google, Microsoft, and Mozilla. It is mainly used for critical code performance and compiling languages other than JavaScript. The compilation starts right from the JavaScript code to the byte code and finally to the machine code. The main aim is to produce the machine code effectively and efficiently. A web assembly mainly has three advantages:

Web assembly can easily be added in JavaScript engines because it is of high level and almost similar to the parts of JavaScript. Instead of replacing the engines, it builds on the infrastructure of engines. This is overall good for the web ecosystem.
It leads to the execution of universal virtual machine. It can easily evaluate and accommodate to the languages which do not compile well with the Java script.
Web assembly helps in browser improvement. It means that the browsers will be able to understand the binary format and will be able to compile binary bundles which will compress smaller than the text JavaScript that we use today. The run time will become much faster depending upon the compiling time optimization.

HOW TO CREATE WEB ASSEMBLY CODE

It is very easy to create the web assembly code. All you need id to write the code manually and use into the textual representation. Then you have to use the binary output using the programmes. After this, you need a compiler which can combine mainly C++ into the web assembly. Now the question arises that which compliers must be used to build the web assembly programmes. Web assembly mainly focuses on C++ but as it is evolving, it will support more languages, for instance, GCC. The web assembly community is, therefore, collaborating with more complier vendors as mentioned above by taking their input into consideration and side by side working with them on ABI matters.

Undoubtedly, web assembly will enable many languages to comply on the web but JavaScript will be the most prominent language having the highest momentum on the web. In a number of configurations, web assembly, and JavaScript shall be used together.

FEATURES OF WEB ASSEMBLY

1) IT IS NOT REPLACING THE JAVASCRIPT: Many developers doubt that web assembly is designed to replace the JavaScript but it is not so .It has been designed to compliment to the JavaScript language instead of replacing it. JavaScript has become increasingly popular among the developers as well as the tool vendors but web assembly will mainly complement it, catering to the needs of the developers by serving as a compiler target. Since web assembly is supported by all the major browser developers, therefore this is made to represent a low-level code and facilitate the missing features which are otherwise absent in the JavaScript.

2) IT IS DEVELOPED BY JOINT EFFORTS: The web assembly is not being developed by a single vendor but it is a cumulative effort. The company Mozilla encompassing very good developers facilitated this service in the form of asm.js to serve as a compiler target. Apart from this, Google worked on the Native client (NACL) which is again a binary format for the web based on LLVM. Web assembly was, therefore, a joint effort providing a browser complier target enabling a bright future.

3) IT IS COMPATIBLE BACKWARDS: Backward compatibility has been an essential feature of the web. All the prototypes will be available for all the browsers.
4) FEATURES WILL BE MORE ENHANCED THAN JAVASCRIPT: The features of web assembly will be more advanced than JavaScript. It means that you can expect the initial versions with better loading time. The web assembly will result in improvements because the binary format will be more faster than the textual representation of asm.js. Some of the improvements which can be expected are dynamic linking, stack inspections, DOM integration, full threading support, integrated garbage collection and multi-process support. All these things will be really hard to compile using the JavaScript. Web assembly will, therefore, serve as a very versatile platform for the languages that support these features.

5) READILY AVAILABLE: All the benefits of the web assembly can be provided in the future. This has been the result of years of experience implementing asm.js and NACL and all the benefits of the implementation shall be provided readily by web assembly. Web assembly has been developed as an up gradation in addition to the current solutions, so if you want to use some benefits right now then asm.js is one of the best solutions that you can go for.

Despite many efforts, web assembly still remains as a work in progress. Developers need to innovate and experiment with the browser implementations and provide valuable feedback to cover the entire specification.

Javascript and web assembly

A Minimalist Guide To Web Assembly