Dan's Thoughts Thinking somewhat carefully

Exercise 1.42 of SICP

Exercise 1.42: Let f and g be two one-argument functions. The composition f after g is defined to be the function . Define a procedure compose that implements composition. For example, if inc is a procedure that adds 1 to its argument,

((compose square inc) 6)
49

(define (compose f g)
  (lambda (x) 
    (f (g x))))
 
(define (square x) (* x x))
(define (inc n) (+ n 1))

> ((compose square inc) 6)
49