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var app = {};
// Generic "model" object. You can use whatever
// framework you want. For this application it
// may not even be worth separating this logic
// out, but we do this to demonstrate one way to
// separate out parts of your application.
app.TodoModel = function (key) {
this.key = key;
this.todos = [];
this.onChanges = [];
};
app.TodoModel.prototype.addTodo = function (title) {
this.todos = this.todos.concat([{
id: Utils.uuid(),
title: title,
completed: false
}]);
};
app.TodoModel.prototype.inform = function() {
// Something changed, but we do nothing
return null;
};
app.TodoModel.prototype.toggleAll = function (checked) {
// Note: it's usually better to use immutable data structures since they're
// easier to reason about and React works very well with them. That's why
// we use map() and filter() everywhere instead of mutating the array or
// todo items themselves.
this.todos = this.todos.map(function (todo) {
return Object.assign({}, todo, {completed: checked});
});
this.inform();
};
app.TodoModel.prototype.toggle = function (todoToToggle) {
this.todos = this.todos.map(function (todo) {
return todo !== todoToToggle ?
todo :
Object.assign({}, todo, {completed: !todo.completed});
});
this.inform();
};
app.TodoModel.prototype.destroy = function (todo) {
this.todos = this.todos.filter(function (candidate) {
return candidate !== todo;
});
this.inform();
};
app.TodoModel.prototype.save = function (todoToSave, text) {
this.todos = this.todos.map(function (todo) {
return todo !== todoToSave ? todo : Object.assign({}, todo, {title: text});
});
this.inform();
};
app.TodoModel.prototype.clearCompleted = function () {
this.todos = this.todos.filter(function (todo) {
return !todo.completed;
});
this.inform();
};
function testModel() {
const model = new app.TodoModel();
model.clearCompleted();
}