Finished implementing code with iterator

src/main.rs

@@ -1,3 +1,75 @@
-fn main() {
-    println!("Hello, world!");
+#[allow(dead_code)]
+#[derive(Debug)]
+struct Song {
+    name: String,
+    artist: String,
+    duration: f32
+}
+
+struct Playlist{
+    songs: Vec<Song>,
+}
+
+impl Playlist{
+    fn new() -> Playlist {
+        Playlist{
+            songs: Vec::new(),
+        }
+    }
+
+    fn iter(&self) -> PlaylistIterator{
+        PlaylistIterator{
+            playlist: self,
+            current_index: 0
+        }
+    }
+
+    fn add_song(&mut self, song: Song){
+        self.songs.push(song);
+    }
+}
+
+struct PlaylistIterator<'a> {
+    playlist: &'a Playlist,
+    current_index: u32,
+}
+
+impl<'a> Iterator for PlaylistIterator<'a>{
+    type Item = &'a Song;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let song = self.playlist.songs.get(self.current_index as usize);
+        self.current_index += 1;
+        song
+    }
+}
+
+fn main() {
+    let mut playlist = Playlist::new();
+
+    playlist.add_song(
+        Song{
+            name: String::from("s1"),
+            artist: String::from("a1"),
+            duration: 1.2
+        }
+    );
+    playlist.add_song(
+        Song{
+            name: String::from("s2"),
+            artist: String::from("a2"),
+            duration: 1.6
+        }
+    );
+    playlist.add_song(
+        Song{
+            name: String::from("s3"),
+            artist: String::from("a3"),
+            duration: 2.2
+        }
+    );
+
+    for song in playlist.iter(){
+        println!("{:?}", song);
+    }
 }