Directions: Can you guess the contract for a function just by seeing how it’s used?
Try to match each Expression in the left column with a Contract in the right column
that describes the function being used. Some expressions or contracts
might not have a match.
(big-star "purple")
; big-star : number string -> image
(big-star 25 "gold")
; message-cost : string -> number
(message-cost 15)
; message-cost : number -> number
(message-cost "where are you?")
; show-score : string string -> image
(show-score "Red Sox" 6 "Cardinals" 4)
; show-score : string number -> image
(show-score "Red Sox" "Cardinals" 5 5)
(find-winner "Red Sox" 4 "Cardinals" 6)
; prefer-flavor : string string -> number
(pick-flavor "vanilla" "oreo" "mint")
; choose-flavor : string string -> string
(prefer-flavor "lemon" "lime")
; pick-flavor : string string string -> image
