lisp

Interesting: https://github.com/robpike/lisp/blob/master/lisp1_5/parse.go... // Expr represents an arbitrary expression. type Expr struct { // An Expr is either an atom, with atom set, or a list, with car and cdr set. // Car and cdr can be nil (empty) even if atom is nil. car *Expr atom *token cdr *Expr } Instead of using interface types for expressions, there is a simple expression structure type with fields that may or may not be set depending on what type of value it is. I probably never would have done it that way, I would probably use an interface type instead. This way actually saves space in cons objects… in the above version, a cons is 24 bytes, and below it would be 32: type Expr interface { } type Cons struct { car, cdr Expr } Not efficient compared to modern Lisp i