More stdlib

1 files changed, 24 insertions, 0 deletions

diff --git a/src/content/chapter4_standard_library/lesson02_result_module/code.gleam b/src/content/chapter4_standard_library/lesson02_result_module/code.gleam
new file mode 100644
index 0000000..8772788
--- /dev/null
+++ b/src/content/chapter4_standard_library/lesson02_result_module/code.gleam
@@ -0,0 +1,24 @@
+import gleam/io
+import gleam/int
+import gleam/result
+
+pub fn main() {
+  io.println("=== map ===")
+  io.debug(result.map(Ok(1), fn(x) { x * 2 }))
+  io.debug(result.map(Error(1), fn(x) { x * 2 }))
+
+  io.println("=== try ===")
+  io.debug(result.try(Ok("1"), int.parse))
+  io.debug(result.try(Ok("no"), int.parse))
+  io.debug(result.try(Error(Nil), int.parse))
+
+  io.println("=== unwrap ===")
+  io.debug(result.unwrap(Ok("1234"), "default"))
+  io.debug(result.unwrap(Error(Nil), "default"))
+
+  io.println("=== pipeline ===")
+  int.parse("-1234")
+  |> result.map(int.absolute_value)
+  |> result.try(int.remainder(_, 42))
+  |> io.debug
+}