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| author | Louis Pilfold <louis@lpil.uk> | 2023-12-20 15:20:27 +0000 |
|---|---|---|
| committer | Louis Pilfold <louis@lpil.uk> | 2023-12-20 15:20:27 +0000 |
| commit | 5e91a50eb28a292eb56b8d5e5a268c115ffdc86d (patch) | |
| tree | a6fa4610928673005b0d56e0b92316cc53649caf /lessons/src/lesson028_alternative_patterns/text.html | |
| parent | 4bcaa207bf0936800f7b9f84efbd135afebd3229 (diff) | |
| download | tour-5e91a50eb28a292eb56b8d5e5a268c115ffdc86d.tar.gz tour-5e91a50eb28a292eb56b8d5e5a268c115ffdc86d.zip | |
List lessons
Diffstat (limited to 'lessons/src/lesson028_alternative_patterns/text.html')
| -rw-r--r-- | lessons/src/lesson028_alternative_patterns/text.html | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lessons/src/lesson028_alternative_patterns/text.html b/lessons/src/lesson028_alternative_patterns/text.html new file mode 100644 index 0000000..10ad731 --- /dev/null +++ b/lessons/src/lesson028_alternative_patterns/text.html @@ -0,0 +1,17 @@ +<p> + Alternative patterns can be given for a case clause using the + <code>|</code> operator. If any of the patterns match then the clause matches. +</p> +<p> + When matching on multiple subjects there must be the same number of patterns + as there are subjects. Try removing one of the <code>_,</code> sub-patterns to + see the compile time error that is returned. +</p> +<p> + If a pattern defines a variable then all of the alternative patterns for that + clause must also define a variable with the same name and same type. +</p> +<p> + Currently it is not possible to have nested alternative patterns, so the + pattern <code>[1 | 2 | 3]</code> is not valid. +</p> |