Deep Lists Assignment
original inspiration for this warmup comes from Extra Practice Problems
Contents
Code To Use
Code To Implement
file: | src/main/racket/deep_lists/deep_lists.rkt | |
functions: | deep-fold deep-flatten deep-sum deep-sum-numbers |
Fold
You can elect to build deep-fold as a higher order function which returns a function which will deep fold left or right depending on which list fold function is passed to it.
NOTE: You can also elect to just build deep-foldl and/or deep-foldr directly. If you choose to implement only one of deep-foldl and deep-foldr, be sure to comment out the tests for the unimplemented one.
deep-fold
(define (deep-fold list-fold) (error 'not-yet-implemented))
deep-foldl
The provided implementation uses #deep-fold. You may replace this if you prefer not to implement #deep-fold.
(define deep-foldl (deep-fold foldl))
deep-foldl
The provided implementation uses #deep-fold. You may replace this if you prefer not to implement #deep-fold.
(define deep-foldr (deep-fold foldr))
Clients
deep-flatten
Utilize a version of #deep-fold (and perhaps a list reverse depending on which fold direction you choose) to produce a single flattened list version of the deep list.
For example:
(deep-flatten (list 1 2 (list 3 "fred" 4 5) 6 (list 7 8 (list 9 "george" 10) 11 12)))
should evaluate to
'(1 2 3 "fred" 4 5 6 7 8 9 "george" 10 11 12)
deep-sum
Sums the numbers in a deep list of numbers and lists.
For example:
(deep-sum (list 1 2 (list 3 4 5) 6 (list 7 8 (list 9 10) 11 12)))
should evaluate to 78.
deep-sum-numbers
Like deep-sum only it ignores values which are neither lists nor numbers.
For example:
(deep-sum-numbers (list 1 2 (list 3 "fred" 4 5) 6 (list 7 8 (list 9 "george" 10) 11 12)))
should evaluate to 78.
Test
file: | deep_lists_test.rkt | Test |
source folder: | src/test/racket/deep_lists |
note: ensure that you have removed all printing to receive credit for any assignment.