Data Types & Structs

• Type checking

(typep foo 'string)
;; NIL
(typep foo 'integer)
;; T

• The ' is just short hand for: (typep foo (quote string))
  • the quote escapes the data to be literal text like:

(quote (+ 1 2))
;; (+ 1 2)

'(+ 1 2)
;; (+ 1 2)