cs378cl p. 7

What is (append '(a b) '(c d)) ?

A: ((a b) (c d))

B: (a b c d)

C: (a b (c d))

D: ((a b c d))

E: ((a b) c d)

Answer: B

append concatenates two lists at top level, making a single list that contains the elements of the two input lists.

append makes a copy of the first input list, and reuses the second input list.