DrRacket Helper-DrRacket Programming Assistance

Example

(define (sum-list lst) (cond [(empty? lst) 0] [else (+ (first lst) (sum-list (rest lst)))]))

Scenario

When a user is unsure how to create a recursive function to sum elements of a list, DrRacket Helper can provide a complete solution with explanation, aligning with educational principles.

Example

;; Purpose: Compute factorial of a number (define (factorial n) (if (= n 0) 1 (* n (factorial (- n 1)))))

Scenario

For students learning about recursion, DrRacket Helper can explain and illustrate how the factorial function is implemented using recursion, including edge cases and base conditions.

Example

;; Error in code: (define (find-max lst) (max lst)) ;; Corrected code: (define (find-max lst) (apply max lst))

Scenario

If a user encounters an error message indicating 'max: expects argument of type <number>; given <list>', DrRacket Helper can explain the issue and provide the corrected form of the function, teaching proper list handling.