2 files changed, 22 insertions, 0 deletions
diff --git a/lessons/src/lesson029_pattern_aliases/code.gleam b/lessons/src/lesson029_pattern_aliases/code.gleam
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+++ b/lessons/src/lesson029_pattern_aliases/code.gleam
@@ -0,0 +1,15 @@
+import gleam/io
+
+pub fn main() {
+  io.debug(get_first_non_empty([[], [1, 2, 3], [4, 5]]))
+  io.debug(get_first_non_empty([[1, 2], [3, 4, 5], []]))
+  io.debug(get_first_non_empty([[], [], []]))
+}
+
+fn get_first_non_empty(lists: List(List(t))) -> List(t) {
+  case lists {
+    [[_, ..] as first, ..] -> first
+    [_, ..rest] -> get_first_non_empty(rest)
+    [] -> []
+  }
+}
diff --git a/lessons/src/lesson029_pattern_aliases/text.html b/lessons/src/lesson029_pattern_aliases/text.html
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+++ b/lessons/src/lesson029_pattern_aliases/text.html
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+<p>
+  The <code>as</code> operator can be used to assign sub patterns to variables.
+</p>
+<p>
+  For example, the pattern <code>[_, ..] as it</code> will match any non-empty
+  list and assign that list to the variable <code>it</code>.
+</p>