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diff --git a/lessons/src/lesson015_anonymous_functions/code.gleam b/lessons/src/lesson015_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(a: Int, function: fn(Int) -> Int) -> Int {
+ function(function(a))
+}