A list is a finite sequence of values. These values need not necessarily have the same data type. List constants are denoted by square brackets. In contrast to C it is possible to use complex expressions as list members when defining a list constant. The empty list is denoted by [].

[ ]
[ 1, 2, true ]
[ variable, 17 + 38, some_function(x, y) ]
[ "list", "of", "strings" ]

Accessing the list elements is done by means of the index operator as in my_list[1]:"error". The list elements are numbered starting with 0, so index 1 returns the second element. After the index operator there must be a colon denoting a following default value that is returned if the list access fails somehow. The default value should have the type that is expected for the current list access, in this case the string “error”.

Note 1: A list preserves order of its elements when iterating over them.

Note 2: There is also another method for accessing lists, originating from the early days of YaST. The command select(my_list, 1, "error") also returns the second element of my_list. While this still works, it is deprecated by now and may be dropped in the future.