DartPractice

// --- Variables and data types --- //

import 'dart:io';

void main() {
  var name = "Affan";
  var roll = 20132;
  var a = 7;
  var b = 2;

  // ---- to know the tyoe of typed variable ----

  // print(name.runtimeType);
  // print(roll.runtimeType);    //return type of variable

  // ---- float division -----

  // print(a / b);
  // print(a ~/ b);       // ignore decimal value

  // ---- Prefix and post fix incremebt and decrement ----

  // print(a);
  // print(++a);  // first evaluate then print
  // print(a++);      // first print then evaluate
  // print(a);

// ---- type test operater ----

  // print(name is String);        // return true
  // print(roll is String);          // return false
  // print(name is! String);          // is not

  // ------ Conditional Expression ----

  // var is_login = true;
  // // ignore: dead_code
  // var check = is_login ? 'Affan' : 'Unknown';  // is login agar true hoa to pahly wala warna second wala
  // print(check);

  // var result = name ?? "Guest";          // agar name may null hoa to (name = null) guest print hoga warna wo hi name
  // print(result);

// --------- String --------

  // var value = "It's a language";
  // var value1 = 'It\'s a language';     // Using escape sequence
  // print(value);
  // print(value1);

  // -------- Expression inside string ------

  // print("My name is $name");
  // print("My name is ${name.toUpperCase()}");  // use {} agar koi expression bhi sat likhna hay to

// ------- Row String -------

  // print(r'this is $affan');   // koi bhi expression work nhi karta. as it is print ho jata

  // -------- String properties and methods -------

  // var lname = "   Minhas   ";

  // print(name.length);
  // print(name.isEmpty);
  // print(name.isNotEmpty);
  // print(name.toUpperCase());
  // print(name.contains("a"));
  // print(name.padLeft(10)); // padding from left
  // print(lname.trim()); // remove white spaces
  // print(lname.trimLeft());
  // print(lname.trimRight());

  // var cname = "Affan Minhas";
  // print(cname.split(" ")); // Return list

  // --------- List ----------

  // ** Fixed lenght list **

  // List<String> myList = new List(3);
  // myList[0] = "Affan";
  // print(myList);

  // ** Growable List **

  // var names = ["Affan", "Hasnain", "Waleed"];
  // var rolls = [132, 83, 134];
  // var sec = [132, "B", 83, "A", 134, "B"];
  // print(names.runtimeType); // print String
  // print(rolls.runtimeType); // print int
  // print(sec.runtimeType); // print object

  // --- specific data type ---

  // var id = <int>[33, 44, 67];
  // //id.add("Affan");      // through error
  // print(id);

  // ---- List into another list -----
  //** Spread Operator ** \\

  // var men = ["Affan", "Hasnain", "Kibriya"];
  // var women = ["Elisa", "Cortona", "Siri"];
  // var developers = ["Elon", ...men];        // men wali lis kay items ajay gen
  // var team = [...men, ...women];
  // print(developers);
  // print(team);

  // ----- list Constructor ---- Empty List -----

  //var students = new List();        // nhi banany dera hay :( ... null safety issue
  // var students = [];
  // students.add("Sufyan");
  // students.add("Rehman");
  // print(students);

  // ------- List Properties and methods -------

  //var student = ["Affan", "Hasnain", "Waleed", "Moiz"];
  // print(student.length);
  // print(student.isEmpty);
  // print(student.isNotEmpty);
  // print(student.reversed);
  // print(student.first);
  // print(student.last);

  // print(student.remove("Moiz"));   // remove the specific data
  // print(student);

  // student.removeAt(3);       // remove from the specific index
  // print(student);

  //--------- Set -----------

  //var place = {"Karachi", "Lahore", "Islamabad"};
  // var money = {200, 400, 600};
  // var every = {"maldives", 30000};
  // print(place.runtimeType);
  // print(money.runtimeType);
  // print(every.runtimeType);
  // var k = <int>{300};
  // k.add(3000);
  // //k.add("Anday garam");          // Through error
  // print(k);

  // ------ different of writing Set -------

  // var names = {};      // Not set it will become map
  // var <String> names = {};
  // var names = <String>{};
  // Set <String> names = {};
  // var names = new Set();
  // var <String> names = Set();
  // place.add("KPK");
  // print(place);

  // --- Set Contains Unique elements ---

  // var values = {1, 3, 5, 6, 2, 1, 3};
  // print(values); // eleminate similar one

  // ------- Map --------

  // var namee = {"harry": "Bhai", "azad": "Bhai"};
  // print(namee.runtimeType);

  // Map<String, String> address = {"lahore": "pakistan", "Karachi": "Pakistan"};
  // print(address.runtimeType);

  //   ** Empty Map Creation ** \\

  // var val = Map(); // Empty map
  // print(val.runtimeType);

  // Map<String, int> clas = Map();
  // print(clas.runtimeType);

  // -------- Add item in the map  ------

  // var book = {};
  // book["Rich Dad"] = "Nepolean";
  // book[10] = "Affan"; // dynamic hay is lye ho jae ga
  // print(book);
  // print(book[10]);     // Accessing values

  // ---------- Map properties and methods --------

  // var addresses = {"hyderabad": "Pak", "Karachi": "Sindh", "lahore": "Punjab"};
  // print(addresses.length);
  // print(addresses.keys);
  // print(addresses.values);
  // print(addresses.containsKey("kpk"));
  // print(addresses.containsValue("Sindh"));

// ----- Control Flow statements ------

  // var id = 3;
  // if (id == 3) {
  //   print("Id found !!");
  // } else {
  //   print("Id not found !!");
  // }

  // var c = 9;
  // if (c == 9) {
  //   print("Given value is $c");
  // } else if (c < 10) {
  //   print("Given value is less than 10");
  // } else if (c > 10) {
  //   print("Given value is greater than 10");
  // } else {
  //   print("Invalid Value!!");
  // }

  // ------- Loops ----------

  //   ** For Loop **   //

  // var lst = ["Affan", "Hasnain", "Waleed"];
  // var inc = 0;
  // for (var i = 0; i < lst.length; i++) {
  //   inc++;
  //   print("$inc is ${lst[i]}");
  // }

  //   ** While Loop  **   //

  // var i = 0;
  // while (i < lst.length) {
  //   ++inc;
  //   print("$inc is ${lst[i]}");
  //   i++;
  // }

  // ------ While True --------

  // var data = true;
  // while (data) {
  //   print("Data Fetching.....");
  // }

// ------- Do While Loop ------

  // var v = 9;
  // do {
  //   print("Number is now $v");
  //   v--;
  // } while (v > 0);

  // ------ For-In Loop ------

  // var lst = ["Affan", "Hasnain", "Sibtain"];
  // for (var student in lst) {
  //   print(student);
  // }

// ------ For-in loop in Map --------

  // var datas = {132: "Affan", 83: "Hasnain", 134: "Waleed"};
  // for (var keys in datas.keys) {
  //   print(keys);
  // }
  // for (var value in datas.values) {
  //   print(value);
  // }

  // ------  For Each Loop ------

  // var lst = ["Affan", "Hasnain", "Sibtain"];
  // lst.forEach((element) => print(element));

  // var datas = {132: "Affan", 83: "Hasnain", 134: "Waleed"};
  // datas.forEach((key, value) => print("$key = $value"));

  // --------- for each loop in list to print index --------

  // var lst = ["Affan", "Hasnain", "Sibtain"];
  // lst.asMap().forEach((i, element) => print("Index $i and value is $element"));

  // -------  Break and Continue  ---------

  // var s = 0;
  // while (true) {
  //   s++;
  //   if (s == 6) {
  //     print("Fetching completed !!");
  //     break;
  //   }
  //   if (s == 3) {
  //     continue; // nichy nhi jae ga ab
  //   }
  //   print("Fetching data..... $s");
  // }

  // ------- Switch Case --------

  // var number = 10;
  // switch (number) {
  //   case 8:
  //     print("Lower value given");
  //     break;
  //   case 10:
  //     print("Perfect !!");
  //     break;
  //   default:
  //     print("Dosen't Exist");
  // }
}