An example using the enum type
enum type is much more complex in Raku than in some other languages, and the details are found in its type description.
This short document will give a simple example of its use as is the usual practice in C-like languages.
Say we have a program that needs to write to various directories; we want a function that, given a directory name, tests it for (1) its existence and (2) whether it can be written to by the user of the program; this implies that there are three possible states from the user perspective: either you can write (
CanWrite), or there is no directory (
NoDir) or the directory exists, but you cannot write (
NoWrite). The results of the test will determine what actions the program takes next.
<CanWrite NoDir NoWrite>;sub check-dir-status( --> DirStat)# test each of three directories by a non-root usermy ='/tmp', # normally writable by any user'/', # writable only by root'~/tmp'; # a non-existent dir in the user's home dirfor -># output# status of dir '/tmp': CanWrite# user can write to dir: /tmp# status of dir '/': NoWrite# status of dir '~/tmp': NoDir