TAPL remains a go-to text for inducting people into PL. I have absolutely no qualms recommending it, because we still use the techniques it teaches. It will no

TAPL remains a go-to text for inducting people into PL. I have absolutely no qualms recommending it, because we still use the techniques it teaches. It will not teach you to implement a full-blown language with a performant runtime or anything like that. It is absolutely a book about theory. But I don't think any part of it is specifically outdated, except maybe that it does not reference any more modern languages (which is not much of an issue, in my opinion).