But, before we do that, let’s look a bit into both techs and try and see what each is about. Hopefully, by the end of this article, you will know which of the two is best for you.
JavasScript – the fast, easy and popular option
Programming languages are either compiled – Java for example – or interpreted. Developers using a compiled language have to manually write a “build” that runs and checks the entire code before it is deployed. This makes the chances of buggy code less likely, but the more code you have, the more time consuming it is. Plus, every time there is a change, the developer rewrites the build and starts the whole process again.
Even though JS has a low entry barrier and is excellent for small projects, large projects will be an issue. Mostly because writing code in pure JS is time-consuming and prone to errors. This means that running the code will be slow and fixing each bug will add more time to the development process.
The keyword above is “compile”. As mentioned, JS is an interpreted language, so it runs the code line by line and allows fast fixes and changes once an issue is spotted. But this creates an issue because every change may affect many other files you didn’t even think of.
TS, on the other hand, is a compiled language, so before the code is deployed, the compiler checks it for errors and alerts the developer. Basically, the compiler does the “build” step for the developer automatically every time there is a change, saving a lot of time.
Data validation with TypeScript
JS is not a strong-type language, which means that developers have to specify different data types in the code manually. This is time-consuming and it risks human-errors as developers might assign the wrong value to the wrong data-type.
TypeScript automatically detects and assigns data-types, so it intuitively knows if a piece of data is a number or a string. This reduces development time and eliminates human error.
The same function is also useful in bug checks. As you might know, ensuring your JS code is bug-free is a three-step process – automated tests, manual self-checks, code reviews from other developers. That is ok for small and simple applications. But, for companies the size of Microsoft, Facebook, or Google, imagine the hundreds of thousands of lines of code that need checking.
Since TypeScript automatically checks the code, it actually removes the “self-check” step in the bug-hunt, reducing development time significantly. Not to mention that it is more reliable as it is a machine checking the code, not a developer who know the code by heart. However, we still strongly recommend you run automated tests and have other developers review the code before deploying it to production. Don’t get lazy now.