Task model

Design the Task class and list structure.

Project: To-do CLI

In this project you will build a to-do CLI. Each lesson adds a piece and the final lesson yields a working app. The first step is the Task class that represents a single task.

A Task has two fields: String title (the task name) and bool done (is it finished?). When a Task is created, done defaults to false. The constructor Task(this.title) sets the title.

Your code will be the foundation for the next lessons. TodoList, addTask, listTasks and completeTask will all use this Task definition. Starting solid matters.

The Task class skeleton

The Task class looks like this: class Task { String title; bool done = false; Task(this.title); }. The title is set by the constructor; done keeps its default false.

Here bool done = false gives the field an initial value. Task(this.title) is the short constructor; it assigns the title parameter straight to the field.

To use the Task write var t = Task('Read a book');. Read the name with t.title and the status with t.done. The next lessons gather these Tasks in a list.

Exercise Define the Task class

Define a Task class with String title, bool done = false fields and a Task(this.title) constructor. Inside main create a Task('Kitap oku') instance; print title and done on separate lines.

Show example solution

class Task {
  String title;
  bool done = false;
  Task(this.title);
}

void main() {
  var t = Task('Kitap oku');
  print(t.title);
  print(t.done);
}

Test yourself

Match the Task parts

String title

Task name
bool done

Completion flag
Task(this.title)

Constructor
false

Initial value
What is done on a new Task?
- true
- null
- Throws
- false
Show answer

false — on a new Task done defaults to false.

Task constructor

class Task {
  String title;
  bool done = false;
  ____(this.title);
}

Show answer

class Task {
  String title;
  bool done = false;
  Task(this.title);
}

Next lesson: Adding tasks

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