Project: To-do list

Overview of the 5-lesson to-do project: manage tasks as objects.

To-do list project

In this project you will build a to-do list application across five lessons. Each task is stored as an object and kept in an array.

The app will support adding, listing, completing and deleting tasks. Each lesson adds one piece and builds on the previous lesson's solution. You will start by defining an empty list and a counter.

Project structure

The app manages four core operations. addTask adds a new task, listTasks shows all of them, completeTask finishes one and deleteTask removes it.

Each task carries three fields: id (a unique number), title (the task name) and completed (is it done). The id values come from a nextId counter that increases with every addition.

How we store the data

We keep the tasks in an array. At first the array is empty: let tasks = []. Each new task is added to this array with push.

Every task needs a unique number. The nextId variable starts at 1 for the first task and grows after each addition. This way two tasks never share the same id.

Exercise Initialize the task list

Define an empty tasks array and a nextId counter set to 1. These two will be the base for the rest of the project.

Show example solution

Start the array with [] and the counter with 1.

Example solution:
let tasks = [];
let nextId = 1;

Test yourself

Which field tracks the completion state of a task?
- id
- title
- completed
- nextId
Show answer

completed — The completed field holds true or false and tells whether the task is finished.

Define the task list array

// Task list
let ____ = [];

Show answer

// Task list
let tasks = [];

Next lesson: Designing the task object

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