Nystrom R. Crafting Interpreters 2021

Textbook in PDF format

Despite using them every day, most software engineers know little about how programming languages are designed and implemented. For many, their only experience with that corner of computer science was a terrifying "compilers" class that they suffered through in undergrad and tried to blot from their memory as soon as they had scribbled their last NFA to DFA conversion on the final exam. While academic language folks sometimes look down on object-oriented languages, the reality is that they are widely used even for language work. GCC and LLVM are written in C++, as are most javascript virtual machines. Object-oriented languages are ubiquitous and the tools and compilers for a language are often written in the same language