Coffee - is a tool to convert a code into a "magic"

Day13 Sevgan ishingiz bilan shug’ullaning.

#savol

Object va dynamic turlarning farqi nima ?

🔽 Object - Dart tilida barcha obyektlar ushbu klasdan meros oladi.

- barcha turlar (int, string, bool, List, Map va barchasi) Object klasidan kelib chiqadi;
- object klasida e'lon qilingan barcha o'zgaruvchilar Object'ning umumiy metodlari bilan ishlay oladi;
- object o'zgaruvchilar compile timeda tekshiriladi va xatoliklarni aniqlaydi;
- agar o'zgaruvchining tur metodlari bilan ishlamoqchi bo'lsangiz cast qilishingizga to'g'ri keldi;
- to'g'ridan to'g'ri null qiymat olmaydi buning uchun nullable qilishingiz kerak ya'ni Object?;

🔽 dynamic - barcha turdagi qiymatlarni qabul qilishi mumkin;

- tekshiruvlar runtime'da amalga oshiriladi;
- runtime check bo'lgani uchun ishlatish havfsiz emas ya'ni runtime error chiqish ehtimoli katta;
- o'zgaruvchining metodlariga kirish mumkin lekin noto'g'ri bo'lsa ya'na runtime error olasiz 😅;

✅ Runtime error lardan bilan yuzlashishni hohlamasangiz Object dan foydalangan maqulroq.

Lekin tashqarida mazza qor yog'yaptiya ? ❄️.

#fun
Testerdan hayot saboqlari:
- Hech qachon front-end back-end'ga, back-end esa front-end'ga ishonmasligi kerak. Tester esa hech biriga ishonib qolmasigi kerak auff😎🤘🤘.

Qiziqtirgan savollarni shu yerga yozishilar mumkin. Oxirida javob beramiz

Interviewer: Sirjoddin Odamboev (4+ years experience);
Candidate: Isroiljon Abduvakhobov (2.5+ years experience);

⚡ Flutter Interview Questions

Programming:

◦ Statically typed programming language and dynamically typed programming language
◦ OOP and its 4 pillars
◦ Difference between abstract classes and interfaces
◦ overloading vs overriding
◦ What is HTTP
◦ SOLID

Dart:

◦ Which platforms dart compiler can compile
◦ Tell me about Dart VM
◦ Tell me about null safety
◦ final vs const
◦ dart collections
◦ dart collections vs package collections
◦ Tell me about map types in dart
◦ Tell me about the object class
◦ The hashCode property uses for what?
◦ Tell me about pattern matching
◦ Tell me about sealed classes
◦ Tell me about macros
◦ EventLoop: events and microtasks

Flutter:

◦ What is flutter?
◦ Flutter architectural overview.
◦ Widgets in flutter
◦ Stateful widget lifecycle
◦ Keys in flutter
◦ Testing in flutter
◦ Trees in flutter
◦ Inherited widget
◦ Buildcontext
◦ Tree shaking
◦ Animations
◦ runZonedGuarded
◦ Platform specific connection
◦ Navigation system in flutter

P.s/ O'ylemanki barchaga foydali bo'ldi.

Eshitib o'rganmoqchi bo'lganlar uchun audio variant.

#savol

Dart'da pattern matching nima ?

Pattern matching - bu o‘zgaruvchilarni aniqlash, shartlarni tekshirish va ma’lumotlarni ajratib olish (destructuring) uchun ishlatiladigan qulay usul. U Dart 3 versiyasidan boshlab qo‘llab-quvvatlanadi va switch operatorida yoki if-case bloklarida ishlatiladi.

1️⃣ Oddit pattern matching (switch bilan) :

void checkValue(Object value) {
  switch (value) {
    case int n:
      print('Bu butun son: $n');
      break;
    case String s:
      print('Bu string: $s');
      break;
    default:
      print('Noma’lum tur');
  }
}

void main() {
  checkValue(42);    // Bu butun son: 42
  checkValue("Salom"); // Bu string: Salom
}

2️⃣ Destructuring (recordlar bilan):

(String, int) getUser() {
  return ('Isroiljon', 25);
}

void main() {
  var (name, age) = getUser();
  print('Ism: $name, Yoshi: $age'); // Ism: Isroiljon, Yoshi: 25
}

bu yerda pattern matching yordamida tuple (Record) qiymatlari ajratib olindi.

3️⃣ if-case bilan pattern matching:

void checkType(Object obj) {
  if (obj case int n) {
    print('Bu butun son: $n');
  } else if (obj case String s) {
    print('Bu string: $s');
  } else {
    print('Noma’lum tur');
  }
}

void main() {
  checkType(100);   // Bu butun son: 100
  checkType('Hello'); // Bu string: Hello
}

4️⃣ Pattern Matching bilan JSON-like obyektlarni ajratish

void checkUser(Map<String, dynamic> user) {
  switch (user) {
    case {'name': String name, 'age': int age}:
      print('Ism: $name, Yoshi: $age');
      break;
    default:
      print('Noto‘g‘ri formatdagi user');
  }
}

void main() {
  var user = {'name': 'Isroiljon', 'age': 25};
  checkUser(user); // Ism: Isroiljon, Yoshi: 25
}

case {'name': String name, 'age': int age} – JSON (Map) ichidagi qiymatlarni ajratib oladi.

#ramazonMuborak 🌙

Olloh bu ramazon oyini chiroyli va o’ziga maqbul amallar bilan o’tkazishlikni hammamizga nasib qilsin. Hammaga Ramazon muborak bo’lsin 😇.