matanlurey

import 'dart:async';

main() {
  // Prints '2017' after a second.
  computeSomething().then(print);
}

Future<int> computeSomething() {
  // Pretend to do a computation, and take some time.
  return new Future.delayed(const Duration(seconds: 1), () => 2017);

matanlurey

import 'dart:async';

final messageStorage = <String>[];

Future save(String message) {
  var completer = new Completer();
  new Future(() => messagesStorage.add(message)).then((_) => completer.complete());
  return completer.future;
}

matanlurey

import 'dart:async';

final messageStorage = <String>[];

Future save(String message) => new Future(() => messageStorage.add(message));

Future<List<String> getAll() => new Future(() => messageStorage);

matanlurey

{
  "Cxxxxxxxxxxx": "axxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
  "axx": "Gxx",
  "mxxxxx": "Gxx",
  "qxxxx": "pxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
  "rxxxxxxxxxx": "dxxx",
  "rxxxxxx": "Mxxxxxxxxxxxxxxxxxxxxx",
  "rxxxxxxx": {
    "ixxxx": [
      {

matanlurey

/// Returns a future that completes when a [Resolver] for Dart [sourceCode].
///
/// ```
/// await resolveSource(r'''
///     import 'dart:collection';
///
///     Map createMap() => {};
/// ''')
/// ```
///

matanlurey

// Define USER as a constant and give it an initial value.
const USER = { name: 'Joe'; }

// This will throw an error.
USER = {};

// But this will not.
USER.name = 'Jill';

matanlurey

main() {
  const user = const {'name': 'Joe'};
  
  // Static error: "Constant variables cannot be assigned a value".
  user = {};
  
  // Runtime error: "Unsupported operation: Cannot modify unmodifiable Map".
  user['name'] = 'Jill';
}

matanlurey

class User {
  final String name;
  
  const User(this.name);
}

main() {
  const user = const User('Joe');
}

matanlurey

class User {
  final String name;
  final List<String> cars;
  
  User(this.name, {this.cars});
}

main() {
  for (var i = 0; i < 100; i++) {
    const users = const {

matanlurey

import 'pacakge:meta/meta.dart';

// Error: This class inherits from a class marked as @immutable, and therefore 
// should be immutable (all instance fields must be final).
@immutable
class User {
  String name;
}