An oldie: https://ashwinram.org/1986/01/28/a-short-ballad-dedicated-to-the-growth-of-programs/ https://ashwinram.org/1986/01/28/a-short-ballad-dedicated-to...

An oldie: https://ashwinram.org/1986/01/28/a-short-ballad-dedicated-to-the-growth-of-programs/ https://ashwinram.org/1986/01/28/a-short-ballad-dedicated-to... Describes the evolution from: (cdr (assq key a-list)) to: (let ((val (assq key a-list))) (cond ((not (null? val)) (cdr val)) (else nil)))