You're about to build a Task Manager — like Todoist, Jira, or Apple Reminders.

You'll be able to create tasks, mark them done, search for specific tasks, and delete them.

When you have 10 tasks, anything works. But what happens when you have 10,000? The wrong approach makes your app freeze.

In this lesson, you'll learn why that happens and how to fix it with a data structure called a Hashmap.