Project design
- Dart course
- Intermediate
- Lesson 112/116
- 6 min
Design the skeleton of the intermediate final mini app.
Project design
In this project we build a Task Manager console app. Each lesson adds one piece and builds on the previous solution.
Step by step: a Task class → a Trackable interface → collections → file input/output → combining with a Stream.
First the foundation: a Task class with an immutable title and a status field. Everything builds on it.
The Task class skeleton
The foundation class: class Task { final String title; bool done; Task(this.title, {this.done = false}); }.
title is immutable (final), done defaults to false. The constructor sets the field with the this.title shorthand.
This skeleton is the base for the interface, collections and file work in later lessons.
Practice Task class and an instance
Define a Task class with final String title and bool done fields, and a Task(this.title, {this.done = false}) constructor. In main create var t = Task('Code write'); and print print(t.title).
Starter code
// Define the Task class
void main() {
// create a Task instance and print the title
}Sample solution
class Task {
final String title;
bool done;
Task(this.title, {this.done = false});
}
void main() {
var t = Task('Code write');
print(t.title);
}Expected output
Code write
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 In which order does the project proceed?
- Stream → file → class
- File → class → Stream
- Class → interface → collections → file → Stream Correct answer
- Collections → class → interface
Explanation: first the class, then interface, collections, file and finally Stream.
2 Task constructor
class Task { final String title; bool done; Task(____, {this.done = false}); }class Task { final String title; bool done; Task(this.title, {this.done = false}); }Explanation: the this.title shorthand sets the field.
3 Task class parts
| Term | Meaning |
|---|---|
final String title |
Immutable title |
bool done |
Status |
this.title |
Constructor shorthand |
{this.done = false} |
Default value |