AllocLens: Paradigm-Aware GC Profiler

I think it's a matter of whether you're programming in a mostly applicative way† or in a more imperative way. Especially in the modern age of generational GC, Lisp cons lists support applicative programming with efficient applicative update, but sacrifice efficiency for certain common operations: indexing to a numerical position in a large list, appending to a list, or doing a lookup in a finite map such as an alist. So, in Common Lisp or Scheme, we are often induced to use vectors or hash tables, sacrificing applicative purity for efficiency—thus Perlis's quip about how purely applicative l

I think it's a matter of whether you're programming in a mostly applicative way† or in a more imperative way. Especially in the modern age of generational GC, Lisp cons lists support applicative programming with efficient applicative update, but sacrifice efficiency for certain common operations: indexing to a numerical position in a large list, appending to a list, or doing a lookup in a finite map such as an alist. So, in Common Lisp or Scheme, we are often induced to use vectors or hash tables, sacrificing applicative purity for efficiency—thus Perlis's quip about how purely applicative l