2.9 Common idioms: map, filter, foldl' and friends
Lesson 14 of 15 · 11:39
About this lesson
The functions you'll reach for every single day: map, filter, foldl', listToAttrs, mapAttrs — and exactly where they live in builtins versus pkgs.lib. A single guided tour through lib/lists.nix (plus noogle.dev for finding the rest) saves more hours than the whole rest of this section combined.