Dart·Dart essentials

Small program

Combine collections and async into a small service.

Beginner 10 min read Lesson 5 of 150 Challenge included

What you will be able to do

Model with a class.
Fetch and map results.
Print a summary.

In plain English

Combine collections and async into a small service.

Model with a class.
Fetch and map results.
Print a summary.

service.dartDART

class Lesson {
  const Lesson(this.title, this.minutes);
  final String title;
  final int minutes;
}

void main() {
  const lessons = [Lesson('HTML', 12), Lesson('CSS', 18)];
  final total = lessons.fold<int>(0, (sum, l) => sum + l.minutes);
  print(total);
}

Your turn

Explain it back

Easy

Answer from memory: Which method folds a collection into one value?

TEXT · starter

Your answer…

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Knowledge checkQuestion 1

Which method folds a collection into one value?

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Next: Drill 1: Summarise — Setup and syntax

Lesson 5 of 150 · 0% of course