PFPL 笔记 - XII Symbolic Data

笔记 12 Symbolic Data

Symbols

A symbol is an atomic datum with no internal structure.

A symbol is just a name, or index, for a family of operation

lzx 同学给出的例子

(define f (+ 1 a)) ; BOOM! 
(define f (mu () (+ 1 a))) ; OK 
(f) ; BOOM! 
(let ((a 1)) (f)) ; 2

Fluid Binding

动态绑定

put 用来给 a 绑定上

get 用来获取 binding