[rust] Raindrops

1 files changed, 28 insertions, 0 deletions

diff --git a/raindrops/src/lib.rs b/raindrops/src/lib.rs
new file mode 100644
index 0000000..811c569
--- /dev/null
+++ b/raindrops/src/lib.rs
@@ -0,0 +1,28 @@
+struct Drops {
+    num: u32,
+    drops: Option<String>
+}
+
+impl Drops {
+    pub fn new(num: u32) -> Drops {
+        Drops { num, drops: None }
+    }
+
+    pub fn add_if_factor(&mut self, div: u32, suffix: &str) {
+        if self.num % div == 0 {
+            self.drops.get_or_insert(String::new()).push_str(suffix);
+        }
+    }
+
+    pub fn get(self) -> String {
+        self.drops.unwrap_or(self.num.to_string())
+    }
+}
+
+pub fn raindrops(n: u32) -> String {
+    let mut drops = Drops::new(n);
+    drops.add_if_factor(3, "Pling");
+    drops.add_if_factor(5, "Plang");
+    drops.add_if_factor(7, "Plong");
+    drops.get()
+}