5. Lists
This section describes list functions.
(list expr*) ↦ (list?)
expr : WAL expression
Returns a list whose elements are the evaluated expressions in the order they were passed to the function.
(first xs)
(second xs)
(last xs)
xs : (list?)
Returns the first, second, or last element of list xs.
(rest xs)
xs : (list?)
Returns a list containing all but the first element of xs.
(in x xs)
x : WAL Expression
xs : (list?)
Returns true if x is an element in xs.
(min xs)
(max xs)
xs : (list?)
Returns the smallest or largest element in xs.
(sum xs)
xs : (list?)
Returns the sum of all elements in xs.
(average xs)
xs : (list?)
Returns the average of all elements in xs.
(length xs)
xs : (list?)
Returns the number of elements in xs.
(map f xs)
f : (lambda [x] body)
xs : (list?)
Returns a list containing (f x) for each x in xs in the order they appear in xs.