10A **list** is a type of noun that you'll frequently encounter when reading and writing Hoon. A list can be thought of as an ordered arrangement of zero or more elements terminated by a `~` (null).
10A **list** is a type of noun that you'll frequently encounter when reading and writing Hoon. A list can be thought of as an ordered arrangement of zero or more elements terminated by a `~` (null).
12−So a list can be either null or non-null. When the list contains only `~` and no items, it's the null list. Most lists are, however, non-null lists, which have has items preceding the `~`. Non-null lists, called _lests_, are cells in which the head is the first list item, and the tail is the rest of the list. The tail is itself a list, and if such a list is also non-null, the head of this sub-list is the second item in the greater list, and so on. To illustrate, let's look at a list `[1 2 3 4 ~]` with the cell-delineating brackets left in:
12+So a list can be either null or non-null. When the list contains only `~` and no items, it's the null list. Most lists are, however, non-null lists, which have items preceding the `~`. Non-null lists, called _lests_, are cells in which the head is the first list item, and the tail is the rest of the list. The tail is itself a list, and if such a list is also non-null, the head of this sub-list is the second item in the greater list, and so on. To illustrate, let's look at a list `[1 2 3 4 ~]` with the cell-delineating brackets left in: