From f92661980deac22b54e79cd44c25caba17910c95 Mon Sep 17 00:00:00 2001
From: Louis Pilfold <louis@lpil.uk>
Date: Thu, 18 Jan 2024 16:44:27 +0000
Subject: Last of the content!

---
 .../lesson03_higher_order_functions/code.gleam         | 18 ++++++++++++++++++
 .../lesson03_higher_order_functions/text.html          | 12 ++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam
 create mode 100644 src/content/chapter1_functions/lesson03_higher_order_functions/text.html

(limited to 'src/content/chapter1_functions/lesson03_higher_order_functions')

diff --git a/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam b/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam
new file mode 100644
index 0000000..e3fb3e7
--- /dev/null
+++ b/src/content/chapter1_functions/lesson03_higher_order_functions/code.gleam
@@ -0,0 +1,18 @@
+import gleam/io
+
+pub fn main() {
+  // Call a function with another function
+  io.debug(twice(1, add_one))
+
+  // Functions can be assigned to variables
+  let function = add_one
+  io.debug(function(100))
+}
+
+fn twice(argument: Int, function: fn(Int) -> Int) -> Int {
+  function(function(argument))
+}
+
+fn add_one(argument: Int) -> Int {
+  argument + 1
+}
diff --git a/src/content/chapter1_functions/lesson03_higher_order_functions/text.html b/src/content/chapter1_functions/lesson03_higher_order_functions/text.html
new file mode 100644
index 0000000..3343e4d
--- /dev/null
+++ b/src/content/chapter1_functions/lesson03_higher_order_functions/text.html
@@ -0,0 +1,12 @@
+<p>
+  In Gleam functions are values. They can be assigned to variables, passed to
+  other functions, and anything else you can do with values.
+</p>
+<p>
+  Here the function <code>add_one</code> is being passed as an argument to the
+  <code>twice</code> function.
+</p>
+<p>
+  Notice the <code>fn</code> keyword is also used to describe the type of the
+  function that <code>twice</code> takes as its second argument.
+</p>
-- 
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