To combine two lists to form a third list, use
append(
+Head, +Tail, -List)
.
To analyze a list into its component lists in various ways, use
append/3
with List instantiated to a proper list. The
reference page for append/3
includes examples of its usage,
including backtracking.
To check the length of a list call length(
+List, -Integer)
.
To produce a list of a certain length, use length/2
with
Integer instantiated and List uninstantiated or
instantiated to a list whose tail is a variable.