From the HackerLinks archive

PLAI

Free programming-languages textbook covering interpreters and semantics.

At a glance:

First seen:2026-07-05

Last seen:2026-07-05

Times seen:1

Website:plai.org

The short version

Free programming-languages textbook covering interpreters and semantics.

Why it caught our attention

Commenters recommended it as the clearer compiler-textbook choice.

Where it surfaced on Hacker News

2026-07-05

Editorial paraphrase

A reply said, 'I would rather recommend https://www.plai.org/,' and the site itself presents PLAI as a free online textbook.

Introduction to Compilers and Language Design (2021)