Program

Play audio slide show -- Keyboard shortcut: 'x'

Back to slide -- Keyboard shortcut: 'u'

previous -- Keyboard shortcut: 'p'

next -- Keyboard shortcut: 'n'

Annotated program -- Keyboard shortcut: 't'

reduction.scm - The function reduce-left.

Lecture 4 - slide 16 : 34
Program 2

(define (reduce-left f lst)
  (reduce-help-left f (cdr lst) (car lst)))

(define (reduce-help-left f lst res)
  (if (null? lst)
      res
      (reduce-help-left f (cdr lst) (f res (car lst)))))