diff options
Diffstat (limited to 'exercises/46_optionals2.zig')
| -rw-r--r-- | exercises/46_optionals2.zig | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/exercises/46_optionals2.zig b/exercises/46_optionals2.zig index a037382..d3f65bb 100644 --- a/exercises/46_optionals2.zig +++ b/exercises/46_optionals2.zig @@ -5,11 +5,23 @@ // linked to the first elephant. This is because we had NO CONCEPT // of a tail that didn't point to another elephant! // +// We also introduce the handy ".?" shortcut: +// +// const foo = bar.?; +// +// is the same as +// +// const foo = bar orelse unreachable; +// +// See if you can find where we use this shortcut below. +// +// Now let's make those elephant tails optional! +// const std = @import("std"); const Elephant = struct { letter: u8, - tail: *Elephant = null, // <---- make this optional! + tail: *Elephant = null, // Hmm... tail needs something... visited: bool = false, }; |