1.42¶

; Let f and g be two one-argument functions. The 
; composition f after g is defined to be the function 
; x 􏰕→ f(g(x)). 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 (inc x) (+ x 1))

((compose square inc) 6) ;Value: 49