Change TodoModel to data class

Author: mkraynov

src/model/TodoModel.kt

@@ -1,19 +1,3 @@
 package model
 
-class TodoModel(val id: String, var title: String, var completed: Boolean = false) {
-    fun toggle(completed: Boolean): TodoModel {
-        return TodoModel(
-                id = id,
-                title = title,
-                completed = completed
-        )
-    }
-
-    fun changeTitle(title: String): TodoModel {
-        return TodoModel(
-                id = id,
-                title = title,
-                completed = completed
-        )
-    }
-}
+data class TodoModel(val id: String, val title: String, val completed: Boolean = false)

src/model/TodosModel.kt

@@ -24,15 +24,15 @@ class TodosModel(val key: String = "todomvc-react-kotlin") {
 
     fun toggleAll(completed: Boolean) {
         todos = todos.map {
-            it.toggle(completed)
+            it.copy(completed = completed)
         }
         inform()
     }
 
     fun toggle(id: String) {
         todos = todos.map {
             when (it.id) {
-                id -> it.toggle(!it.completed)
+                id -> it.copy(completed = !it.completed)
                 else -> it
             }
         }
@@ -47,7 +47,7 @@ class TodosModel(val key: String = "todomvc-react-kotlin") {
     fun save(todo: TodoModel, text: String) {
         todos = todos.map {
             when (it) {
-                todo -> todo.changeTitle(text)
+                todo -> todo.copy(title = text)
                 else -> it
             }
         }