Understanding letf and how it replaces flet 31 Aug 2014, by Artur Malabarba. Once you've come to terms with power of setf, it is time to meet its older sister, cl-letf. As the name implies, letf is to setf like let is to setq, but, once again, that is only the tip of the iceberg. To get started, let's have a variable and require the feature. (require 'cl-lib) (setq my-list '(0 1 2 3 4 5)) When tem