diff options
Diffstat (limited to 'src/content/chapter5_advanced_features/lesson04_panic')
| -rw-r--r-- | src/content/chapter5_advanced_features/lesson04_panic/code.gleam | 15 | ||||
| -rw-r--r-- | src/content/chapter5_advanced_features/lesson04_panic/en.html | 11 |
2 files changed, 26 insertions, 0 deletions
diff --git a/src/content/chapter5_advanced_features/lesson04_panic/code.gleam b/src/content/chapter5_advanced_features/lesson04_panic/code.gleam new file mode 100644 index 0000000..fce9d66 --- /dev/null +++ b/src/content/chapter5_advanced_features/lesson04_panic/code.gleam @@ -0,0 +1,15 @@ +import gleam/io + +pub fn main() { + print_score(10) + print_score(100_000) + print_score(-1) +} + +pub fn print_score(score: Int) { + case score { + score if score > 1000 -> io.println("High score!") + score if score > 0 -> io.println("Still working on it") + _ -> panic as "Scores should never be negative!" + } +} diff --git a/src/content/chapter5_advanced_features/lesson04_panic/en.html b/src/content/chapter5_advanced_features/lesson04_panic/en.html new file mode 100644 index 0000000..c54c217 --- /dev/null +++ b/src/content/chapter5_advanced_features/lesson04_panic/en.html @@ -0,0 +1,11 @@ +<p> + The <code>panic</code> keyword is similar to the <code>todo</code> keyword, + but it is used to crash the program when the program has reached a point that + should never be reached. +</p> +<p> + This keyword should almost never be used! It may be useful in initial + prototypes and scripts, but its use in a library or production application is + a sign that the design could be improved. With well designed types the type + system can typically be used to make these invalid states unrepresentable. +</p> |