Summary - Packages

Combine pubspec, pub get and import to set up a package structure.

Summary: Packages

In this group you saw the pub commands, the pubspec.yaml structure, dart pub get, the import statement and dart pub publish. Packages are the foundation of the Dart ecosystem.

Now we combine them: we will import the dart:math and dart:convert libraries and turn a Map into JSON.

Remember: pubspec lists dependencies; pub get fetches; import uses; publish publishes.

Exercise max and min JSON

Import the libraries with import 'dart:math'; and import 'dart:convert';. In main pass the Map {'max': max(3, 7), 'min': min(3, 7)} to jsonEncode inside print.

Show example solution

import 'dart:math';
import 'dart:convert';

void main() {
  print(jsonEncode({'max': max(3, 7), 'min': min(3, 7)}));
}

Test yourself

Concept matching

pub

Package manager
pubspec.yaml

Configuration
dart pub get

Fetching
import

Importing
When is dart pub get run?
- When publishing
- When dependencies change
- When writing tests
- When defining a class
Show answer

When dependencies change — pub get is run when dependencies change.
The import statement
```
____ 'dart:math';
```
Show answer
```
import 'dart:math';
```

Next lesson: Exception hierarchy

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