Miscellaneous

nil

Construct with no projections

A value that signifies an optional value that has been omitted, an ordered comparison that resulted in equality, or an empty list.

yep

Construct with val

A value that signifies a successful result, an optional value that is present, or an ordered comparison that determines the inputs were successfully in ascending order already.

nope

Construct with nope

A value that signifies an unsuccessful result or an ordered comparison that determines the inputs were not successfully in ascending order already.

cons

Construct with car cdr

Represents a linked list with the indicated car as its head element and the indicated cdr as its linked list tail.

assoc

Construct with key val

Represents a key-value pair.

A linked list can have these as its elements to represent an ordered mapping known as an association list.