From 437d456cd504ca4124ef72ea4fb1576ec29563cd Mon Sep 17 00:00:00 2001 From: Louis Pilfold Date: Sat, 9 Dec 2023 15:21:10 +0000 Subject: More on functions --- lessons/src/lesson017_generic_functions/code.gleam | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 lessons/src/lesson017_generic_functions/code.gleam (limited to 'lessons/src/lesson017_generic_functions/code.gleam') diff --git a/lessons/src/lesson017_generic_functions/code.gleam b/lessons/src/lesson017_generic_functions/code.gleam new file mode 100644 index 0000000..e232bf8 --- /dev/null +++ b/lessons/src/lesson017_generic_functions/code.gleam @@ -0,0 +1,19 @@ +import gleam/io + +pub fn main() { + let add_one = fn(x) { x + 1 } + let exclaim = fn(x) { x <> "!" } + + // Invalid, Int and String are not the same type + // twice(10, exclaim) + + // Here the type variable is replaced by the type Int + io.debug(twice(10, add_one)) + + // Here the type variable is replaced by the type String + io.debug(twice("Hello", exclaim)) +} + +fn twice(argument: value, function: fn(value) -> value) -> value { + function(function(argument)) +} -- cgit v1.2.3