matsuhiro

import 'dart:ui';

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

matsuhiro

import sketch from "sketch";

// const Style = require("sketch/dom").Style;
// const SharedStyle = require("sketch/dom").SharedStyle;
// const Flow = require("sketch/dom").Flow;
// const Rectangle = require("sketch/dom").Rectangle;
// const SmartLayout = require("sketch").SmartLayout;
// const Group = require("sketch/dom").Group;
// const Artboard = require("sketch/dom").Artboard;
// const Shape = require("sketch/dom").Shape;

matsuhiro

/***
 * Excerpted from "Functional Programming in Java",
 * published by The Pragmatic Bookshelf.
 * Copyrights apply to this code. It may not be used to create training material, 
 * courses, books, articles, and the like. Contact us if you are in doubt.
 * We make no guarantees that this code is fit for any purpose. 
 * Visit http://www.pragmaticprogrammer.com/titles/vsjava8 for more book information.
***/
package fpij;

matsuhiro

void main() {
  
  try {
    throw 1;
  } catch (e) {
    print('What is thrown: $e');
  }
  
  printDivider();
  try {

matsuhiro

E/flutter (21138): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.
E/flutter (21138): If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
E/flutter (21138): If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.
E/flutter (21138): #0      defaultBinaryMessenger.<anonymous closure> (package:flutter/src/services/binary_messenger.dart:73:7)
E/flutter (21138): #1      defaultBinaryMessenger (package:flutter/src/services/binary_messenger.dart:86:4)
E/flutter (21138): #2      MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:140:62)
E/flutter (21138): #3      MethodChannel.invokeMethod

matsuhiro

typedef Compare = int Function(Object a, Object b);

class SortedCollection {
  Compare compare;

  SortedCollection(this.compare);
}

// Initial, broken implementation.
int sort(Object a, Object b) => 0;

matsuhiro

Future<int> sumStream(Stream<int> stream) async {
  var sum = 0;
  await for (var value in stream) {
    print("sum = $sum");
    sum += value;
  }
  return sum;
}

Stream<int> countStream(int to) async* {

matsuhiro

void main() {
  try {
    throw Exception();
  } on Exception {
    // A specific exception
    print('Exception exception');
  } catch (e) {
    // No specified type, handles all
    print('Something really unknown: $e');
  }

matsuhiro

void main() {
  var names = <String>{};
  print(names);
  
  Set<String> set = {};
  print(set);
  Map<String, String> map = {};
  print(map);
  var set_or_map = {};
  print(set_or_map is Set);

matsuhiro

void main() {
  var constantList = const [1, 2, 3];
  // constantList[1] = 1; // Uncommenting this causes an error.
  
  var list = [1, 2, 3];
  var list2 = [0, ...list, ...list];
  print(list2);
  
  var promoActive = false;
  var nav = [