elbeicktalat

How to create a Singleton Obejct using Dart

First of all why to create a Singleton object? The answer to this question is very simple, If you have a class or object that you use twice and you want to repeat using the same instance of it, you guest use a Singleton.

There are several ways to create a Singleton object each one of them shine for specific using.

I will show you how to create a Singleton and Which/Why approach to use.

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Sub InsertBarCode()

    ' Delete all inserted pictures, this will help us to delete BarCodes before creating new one.
    ActiveSheet.Pictures.Delete
    
    ' Your data, can be whatever such as color, style number etc.
    Data = Cells(2, 1)
    
    FilePath = "https://barcode.tec-it.com/barcode.ashx?data=" & Data
    

elbeicktalat

' 1) Open the developer mode
' 2) On the left bar, under `Microsoft Excel Objects` tab open your sheet you want to observe changes 
' 3) Paste the code you find below

Private Sub Worksheet_Change(ByVal Target As Range)
   Dim KeyCells As Range

' The variable KeyCells contains the cells that will
    ' run you code when they are changed.
    Set KeyCells = Range("A1:A3")

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package com.elbeicktalat;

import lombok.RequiredArgsConstructor;
import org.json.JSONArray;
import org.json.JSONObject;
import org.openqa.selenium.Cookie;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.json.Json;

import java.io.File;

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import 'dart:async';
import 'package:flutter/material.dart';
import 'package:palette_generator/palette_generator.dart';

void main() => runApp(const MyApp());

// need to change
const String _imagePath = 'assets/images/profiles/onboarding_1.jpg';
const String _appName = 'Color Picker';

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void main() {
  Person personA = Person();
  Person personB = Person();
  print(personA);
  print(personB);
  print(identical(personA, personB)); // if this return `true`, that mains this class is singleton.
}

elbeicktalat

class Colors {
  static String black(String text) {
    return '\x1B[30m$text\x1B[0m';
  }

  static String red(String text) {
    return '\x1B[31m$text\x1B[0m';
  }

  static String green(String text) {