Add unwrap function to option module

1 files changed, 17 insertions, 0 deletions

diff --git a/src/gleam/option.gleam b/src/gleam/option.gleam
index e5be4cc..663cd1f 100644
--- a/src/gleam/option.gleam
+++ b/src/gleam/option.gleam
@@ -68,3 +68,20 @@ pub fn from_result(result: Result(a, e)) -> Option(a) {
     _ -> None
   }
 }
+
+/// Extract the value from an option, returning a default value if there is none.
+///
+/// ## Examples
+///
+///    > unwrap(Some(1), 0)
+///    1
+///
+///    > unwrap(None, 0)
+///    0
+///
+pub fn unwrap(option: Option(a), or default: a) -> a {
+  case option {
+    Some(x) -> x
+    None -> default
+  }
+}