Dalmangyi

//lib/sqlite/db_helper.dart


import 'dart:io';

import 'package:path_provider/path_provider.dart';
import 'package:sqflite/sqflite.dart';
import 'package:path/path.dart';

import 'models/dog_model.dart';

Dalmangyi

  //Create
  createData(Dog dog) async {
    final db = await database;
    var res = await db.rawInsert('INSERT INTO $TableName(name) VALUES(?)', [dog.name]);
    return res;
  }

  //Read
  getDog(int id) async {
    final db = await database;

Dalmangyi

class Dog {
  final int id;
  final String name; 
 
  Dog({this.id, this.name}); 
}

Dalmangyi

Function makeAdder(num addBy) {
  return (num i) => addBy + i;
}

void main() { 
  var add2 = makeAdder(2); 
  var add4 = makeAdder(4);

  print(add2(3));
  print(add4(3));

Dalmangyi

import 'dart:async';
import 'dart:isolate';

void main() {
  Isolate.spawn(sendMessage, 'Hello');
  Isolate.spawn(sendMessage, 'Greetings');
  Isolate.spawn(sendMessage, 'Welcome');
}

void sendMessage(var message) {

Dalmangyi

void main() {
  //Iterable
  Stream.fromIterable([1,2,3,4,5])
      .listen((int x) => print('iterable : ${x}'));

  //Periodic
  Stream.periodic(Duration(seconds: 1), (x) => x) 
      .take(5)
      .listen((x) => print('take : ${x}'));

Dalmangyi

import 'dart:async';

main() async {
  countSeconds(4);
  await message();
}

void countSeconds(s) {
  for(var i=1; i<=s; i++ ) { 
      Future.delayed(Duration(seconds: i), () => print(i));

Dalmangyi

import 'dart:async';

int a = 0;
void main() async {

  print('first');
  func();
  print('second');
  await func();
  print('third');

Dalmangyi

void main(){
  var data = [1, 2, 3, 4, 5];
  
  //forEach
  print('forEach1');
  var eachData = data.forEach((value) { 
    print(value);
    return value;
  });
  //print(eachData); //eachData is void.

Dalmangyi

void main(){
	var movie = Movie();
	movie..showCount()
		..showCount()
		..showCount();
	
	var last = movie..minusCount()
		..minusCount()
		..minusCount();
	print('last:$last');