Update worlds example.

examples/d_string.dm

@@ -1,16 +0,0 @@
-class World(pub name: String, pub color: String)
-    pub static worlds = [
-        World('Mercury', 'Red'),
-        World('Earth', 'Blue'),
-        World('Jupiter', 'Orange')
-    ]
-
-    pub static getWorld(color: String) -> String = worlds
-        .find { it.color == color }
-        .map { it.name }
-        .expect "No world has the given color ${color}."
-end
-
-fn main()
-    println "Hello, ${World::getWorld('Blue')}!"
-end

examples/worlds.dm

@@ -0,0 +1,19 @@
+class World(pub name: String, pub color: String) end
+
+fn getWorlds() -> List<World> = [
+    World('Mercury', 'Red'),
+    World('Earth', 'Blue'),
+    World('Jupiter', 'Orange')
+]
+
+fn findWorldByColor(worlds: List<World>, color: String) -> String
+    worlds.find { it.color == color }
+        .map { it.name }
+        .expect "No world has the given color ${color}"
+end
+
+fn main()
+    let worlds = getWorlds()
+    let blueWorld = findWorldByColor(worlds, 'Blue')
+    println "Hello, ${blueWorld}!"
+end