Shplait Lambda 4 Exp And Parse

Summary

Representing `fun` forms and motivating the associated generalization of application forms. Our third and final step in understanding the letrec encoding is to identify the equivalent expression that Updating `interp` to support `fun` expressions. Looking at the evaluation of `fun` forms and the representing the result as a closure. Distinguishing expressions from values, and treating functions as values. Local bindings via `let` can be implemented by making Moe's ` neetcode.io/ - A better way to prepare