Daniel Rodríguez Rivero I updated the post because I don’t want my readers to think that interfaces are exclusive to TypeScript. How can Interfaxes be used in functional programming other than defining types for objects? Can you show me an example in a code snippet?

Thanks for pointing that out. I updated the context to make my idea more clear: In JavaScript, we have 2 main paradigms: functional programming, and object-oriented programming. Interfaces are specific and explicit to OOP and cannot be used in functional programming.

Thank you Timo for sharing your knowledge. You gave me insight about this. This is indeed worth sharing.

Thanks Timo again for sharing experience from your life. I guess soft skills are what makes the difference. Anyone can learn technical skills, but soft skills require building of character.

Thanks very much for the feedback. Technically, you're 100% correct. I used the term "compiler" as a general term for something that converts X to Y without going into technical discussion of compiler vs. transpiler. I could have gone into more technical discussion about bytecode vs. machine code. It was not my intention from the post.