kururu-abdo

using System.Text.RegularExpressions;

public static class StringExtensions
{
    // remove double spaces
    public static string RemoveExtraSpaces(this string sender, bool trimEnd = false)
    {
        const RegexOptions options = RegexOptions.None;
        var regex = new Regex("[ ]{2,}", options);
        var result = regex.Replace(sender, " ");

kururu-abdo

const totalTypes = {
  VIEWS: 2,
  READS: 3,
  FANS: 5
};

const getTotal = tableColumn =>
  [
    ...document.querySelectorAll(
      `td:nth-child(${tableColumn}) > span.sortableTable-number`

kururu-abdo

This is a quick guide to Kotlin programming language. The previous part of this guide is here

#Object Oriented

fun main(args : Array<String>) {
  class local (val x : Int)
  
  val y = local(10)
 println("${y.x}")

kururu-abdo

#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

kururu-abdo

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:get_storage/get_storage.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  await initialConfig();

  final storage = Get.find<StorageService>();

kururu-abdo

class MainScreen extends StatefulWidget {
  State createState() => MainScreenState();
}

class MainScreenState extends State<MainScreen> {
  var _androidAppRetain = MethodChannel("android_app_retain");

  @override
  void initState() {
    super.initState();

kururu-abdo

class MainActivity : FlutterActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        GeneratedPluginRegistrant.registerWith(this)

        MethodChannel(flutterView, "android_app_retain").apply {
            setMethodCallHandler { method, result ->
                if (method.method == "sendToBackground") {
                    moveTaskToBack(true)
                }

kururu-abdo

private fun createNativeView(handle: Long) {
    FlutterMain.ensureInitializationComplete(this, arrayOf())

    val nativeView = FlutterNativeView(this, true)

    val callback = FlutterCallbackInformation.lookupCallbackInformation(handle)
    nativeView.runFromBundle(FlutterRunArguments().apply {
        bundlePath = FlutterMain.findAppBundlePath(this@Service)
        libraryPath = callback.callbackLibraryPath
        entrypoint = callback.callbackName

kururu-abdo

import 'dart:async';

import 'package:flutter/cupertino.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:location/location.dart';

class PersonLocationProvider extends ChangeNotifier {
  Location _location = new Location();
  PermissionStatus _permissionGranted;
  StreamController<LocationData> currentLocation = StreamController.broadcast();

kururu-abdo

import 'dart:io';
import 'package:flutter/material.dart';

import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'package:provider/provider.dart';
import 'package:clippy_flutter/clippy_flutter.dart';

void main() {
  runApp(
    ChangeNotifierProvider(