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-rw-r--r--src/content/chapter2_flow_control/lesson07_alternative_patterns/code.gleam14
-rw-r--r--src/content/chapter2_flow_control/lesson07_alternative_patterns/text.html17
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diff --git a/src/content/chapter2_flow_control/lesson07_alternative_patterns/code.gleam b/src/content/chapter2_flow_control/lesson07_alternative_patterns/code.gleam
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+import gleam/io
+import gleam/int
+
+pub fn main() {
+ let number = int.random(10)
+ io.debug(number)
+
+ let result = case number {
+ 2 | 4 | 6 | 8 -> "This is an even number"
+ 1 | 3 | 5 | 7 -> "This is an odd number"
+ _ -> "I'm not sure"
+ }
+ io.debug(result)
+}
diff --git a/src/content/chapter2_flow_control/lesson07_alternative_patterns/text.html b/src/content/chapter2_flow_control/lesson07_alternative_patterns/text.html
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+<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>