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diff --git a/src/content/chapter1_functions/lesson04_anonymous_functions/code.gleam b/src/content/chapter1_functions/lesson04_anonymous_functions/code.gleam
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+++ b/src/content/chapter1_functions/lesson04_anonymous_functions/code.gleam
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+import gleam/io
+
+pub fn main() {
+  // Assign an anonymous function to a variable
+  let add_one = fn(a) { a + 1 }
+  io.debug(twice(1, add_one))
+
+  // Pass an anonymous function as an argument
+  io.debug(twice(1, fn(a) { a * 2 }))
+}
+
+fn twice(argument: Int, function: fn(Int) -> Int) -> Int {
+  function(function(argument))
+}