Why use it So far all we've discussed just feels like adding restrictions to your code. So what is the real benefit and why do so many people love using Typescript? Because of the restrictions. Restrictions are good. When developing by yourself- You restrict yourself from using your variables or methods incorrectly. This means you won't have as many confusing bugs that are hard to track down. You'll be able to catch these bugs before you even run the code. What you're really doing is describing your code and how it behaves to the typescript compiler and your code editor. By learning to describe your code accurately- you will not only write safer and less buggy code, but you'll become a stronger developer. You'll more clearly understand all code, not just your own. The benefits really shine when working in a team. By adding all these types and 'restrictions' to the code you write- you can enforce how other people on your team use your code. If you write a function that explicitly takes a string as an argument and returns an array- no one on your team will accidentally pass in a number to the function. And they'll know the return type without even looking at your code just by hovering over your function they imported.