From 51a1fcbd0e42b25238877d3ad05d1690e8bc1553 Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Wed, 3 Jan 2024 19:48:25 +0000
Subject: More stdlib

---
 .../lesson04_option_module/code.gleam                    | 14 ++++++++++++++
 .../lesson04_option_module/text.html                     | 16 ++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 src/content/chapter4_standard_library/lesson04_option_module/code.gleam
 create mode 100644 src/content/chapter4_standard_library/lesson04_option_module/text.html

(limited to 'src/content/chapter4_standard_library/lesson04_option_module')

diff --git a/src/content/chapter4_standard_library/lesson04_option_module/code.gleam b/src/content/chapter4_standard_library/lesson04_option_module/code.gleam
new file mode 100644
index 0000000..eb60001
--- /dev/null
+++ b/src/content/chapter4_standard_library/lesson04_option_module/code.gleam
@@ -0,0 +1,14 @@
+import gleam/io
+import gleam/option.{type Option, None, Some}
+
+pub type Person {
+  Person(name: String, pet: Option(String))
+}
+
+pub fn main() {
+  let person_with_pet = Person("Al", Some("Nubi"))
+  let person_without_pet = Person("Maria", None)
+
+  io.debug(person_with_pet)
+  io.debug(person_without_pet)
+}
diff --git a/src/content/chapter4_standard_library/lesson04_option_module/text.html b/src/content/chapter4_standard_library/lesson04_option_module/text.html
new file mode 100644
index 0000000..881ea94
--- /dev/null
+++ b/src/content/chapter4_standard_library/lesson04_option_module/text.html
@@ -0,0 +1,16 @@
+<p>
+  Values in Gleam are not nullable, so the
+  <a href="https://hexdocs.pm/gleam_stdlib/gleam/option.html"
+    ><code>gleam/option</code></a
+  >
+  standard library module defines Gleam's <code>Oction</code> type, which can be
+  used to represent a value that is either present or absent.
+</p>
+
+<p>
+  The option type is very similar to the result type, but it does not have an
+  error value. Some languages have functions return an option when there is no
+  extra error detail to give, but Gleam always uses result. This makes all
+  failible functions consistent and removes any boilerplate that would be
+  required when mixing functions that use each type.
+</p>
-- 
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