dart: initializer list in dart

Signed-off-by: Ayush Dubey <ayushdubey70@gmail.com>

Author: Ayushd70

dart/initializerList.dart

@@ -0,0 +1,19 @@
+import 'dart:math';
+
+class Position {
+  final int x;
+  final int y;
+  final double rad;
+
+  //initializer field
+  Position(int x, int y)
+      : this.x = x,
+        this.y = y,
+        rad = atan2(y, x);
+}
+
+main() {
+  var p = new Position(2, 3);
+  print('x: ${p.x} y: ${p.y}');
+  print('rad: ${p.rad}');
+}