From b3a992440c672afd7bc96b336f5c2ece6231166f Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Wed, 20 Dec 2023 19:12:38 +0000
Subject: Custom types

---
 lessons/src/lesson030_tuples/code.gleam | 10 ++++++++++
 lessons/src/lesson030_tuples/text.html  | 20 ++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 lessons/src/lesson030_tuples/code.gleam
 create mode 100644 lessons/src/lesson030_tuples/text.html

(limited to 'lessons/src/lesson030_tuples')

diff --git a/lessons/src/lesson030_tuples/code.gleam b/lessons/src/lesson030_tuples/code.gleam
new file mode 100644
index 0000000..d5c6313
--- /dev/null
+++ b/lessons/src/lesson030_tuples/code.gleam
@@ -0,0 +1,10 @@
+import gleam/io
+
+pub fn main() {
+  let triple = #(1, 2.2, "three")
+  io.debug(triple)
+
+  let #(a, _, _) = triple
+  io.debug(a)
+  io.debug(triple.1)
+}
diff --git a/lessons/src/lesson030_tuples/text.html b/lessons/src/lesson030_tuples/text.html
new file mode 100644
index 0000000..f121a9d
--- /dev/null
+++ b/lessons/src/lesson030_tuples/text.html
@@ -0,0 +1,20 @@
+<p>
+  Lists are good for when we want a collection of one type, but sometimes we
+  want to combine multiple values of different types. In this case tuples are a
+  quick and convenient option.
+</p>
+<p>
+  The tuple access syntax can be used to get elements from a tuple without
+  pattern matching. <code>some_tuple.0</code> gets the first element,
+  <code>some_tuple.1</code> gets the second element, etc.
+</p>
+<p>
+  Tuples are generic types, they have type parameters for the types they
+  contain. <code>#(1, "Hi!")</code> has the type <code>#(Int, String)</code>,
+  and <code>#(1.4, 10, 48)</code> has the type <code>#(Float, Int, Int)</code>.
+</p>
+<p>
+  Tuples are most commonly used to return 2 or 3 values from a function. Other
+  times it is often is clearer to use a <em>custom type</em>, which we will
+  cover next.
+</p>
-- 
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