A cult classic programming book on Lisp macros is now free online

The book 'Let Over Lambda,' first published in 2008 to coincide with the 50th anniversary of the Lisp programming language (invented in 1958), has been made freely available online in HTML and PDF formats. Authored by Doug Hoyte, the book is a deep dive into Common Lisp macros, advanced techniques, and the philosophy of programming, arguing that macros enable a unique level of abstraction and power not found in other languages.

While programming practices have evolved since its publication, the book remains a celebrated, hardcore tutorial on Lisp's most powerful features. It represents a significant contribution to programming literature, making its advanced concepts accessible to a new generation of developers for free. The release underscores Lisp's enduring influence and the timeless value of understanding foundational programming paradigms.