Module 09 - Day 3

What is the main concept of the mapping idiom?

• It changes the data type of the list.

• It applies a transformation to every list element.

• It sorts the list in ascending order.

• It removes duplicates from the list.

What is the purpose of introducing an auxiliary parameter in my-map?

• To simplify the code

• To abstract the desired transformation

• To increase execution speed

• To reduce memory usage

Which of the following patterns represents the map function: (map f (list x1 x2 ... xn)) ⇒

• ⇒ (list (f x1) (f x2) ... (f xn))

• ⇒ (list x1 x2 ... xn)

• ⇒ (f (list x1 x2 ... xn))

• ⇒ (list x1 x2 ... xn f)

What function captures the specialized pattern of mapping from natural numbers: 0, 1, 2 ... n-1?

• map-list

• build-list

• create-list

• generate-list

What is the purpose of asking the caller to provide a base value in the context of abstract folding?

• To simplify the code

• To ensure the function always returns a list

• To handle unknown base values in any given context

• To make the function faster

Which built-in function works just like my-fold?

• map

• filter

• foldr

• fold

What purpose does the auxiliary parameter combine serve in foldr?

• The combine parameter indicates the maximum depth of the fold operation.

• The combine parameter is used to specify the data type of the input list.

• The combine parameter determines the base case for foldr.

• The combine parameter specifies how to combine the list element with the recursive result.

Which of the following expressions is equivalent to (foldr cons empty (list 1 2 3))?

• (list (list 1 2 3))

• (list empty 1 2 3)

• (list 1 2 3)

• Error: cons cannot be used

Given the expression (foldr - 0 (list 1 2 3)), what is the result?

• -4

• -2

• 2

• 0

What is the result of the code?

• (list 1 4 9 16 25 36)

• (list 25 36 1 4 9 16)

• (list 25 36 16 9 4 1)

• (list (list 1 4 9 16) (list 25 36))

• Error