Merge branch '5.0-dev'

1 files changed, 37 insertions, 0 deletions

diff --git a/exercises/options/options1.rs b/exercises/options/options1.rs
new file mode 100644
index 0000000..038fb48
--- /dev/null
+++ b/exercises/options/options1.rs
@@ -0,0 +1,37 @@
+// options1.rs
+// Execute `rustlings hint options1` or use the `hint` watch subcommand for a hint.
+
+// I AM NOT DONE
+
+// you can modify anything EXCEPT for this function's signature
+fn print_number(maybe_number: Option<u16>) {
+    println!("printing: {}", maybe_number.unwrap());
+}
+
+// This function returns how much icecream there is left in the fridge.
+// If it's before 10PM, there's 5 pieces left. At 10PM, someone eats them
+// all, so there'll be no more left :(
+// TODO: Return an Option!
+fn maybe_icecream(time_of_day: u16) -> Option<u16> {
+    // We use the 24-hour system here, so 10PM is a value of 22
+    ???
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn check_icecream() {
+        assert_eq!(maybe_icecream(10), Some(5));
+        assert_eq!(maybe_icecream(23), None);
+        assert_eq!(maybe_icecream(22), None);
+    }
+
+    #[test]
+    fn raw_value() {
+        // TODO: Fix this test. How do you get at the value contained in the Option?
+        let icecreams = maybe_icecream(12);
+        assert_eq!(icecreams, 5);
+    }
+}