Yaser-Alkhayyat

quiz_app/.gitignore

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+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/

quiz_app/CHANGELOG.md

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+## 1.0.0
+
+- Initial version.

quiz_app/README.md

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+A sample command-line application with an entrypoint in `bin/`, library code
+in `lib/`, and example unit test in `test/`.

quiz_app/analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

quiz_app/bin/end_message.dart

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+// print suitable message for each category of score
+String endMessage({required String name, required int score, required Map<String, Map> quiz}) {
+  if(score == quiz.length) {
+    return "Well Done $name 🥳⭐\nYour score is $score/${quiz.length}";
+  }
+  else if (score > quiz.length~/2) {
+    return("Almost there $name 💪\nYour score is $score/${quiz.length}");
+  }
+  else {
+    return("Bad luck today $name 😢\nYour score is $score/${quiz.length}");
+  }
+}

quiz_app/bin/get_questions.dart

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+// function to get shuffled questions
+Map<String, Map> getQuestions() {
+// initialize quiz
+  Map<String, Map> quiz = {
+    'What is git ?': {
+      'answers': ['Version Control System','Nickname for github','Programming language'],
+      "correct": 'Version Control System'
+    },
+    'What is the command to get the current status of the Git repository ?': {
+      'answers': ['git config --status', 'git getStatus', 'git status'],
+      'correct': 'git status'
+    },
+    'What is the command to initialize Git on the current repository ?': {
+      'answers': ['git init', 'git start', 'git begin'],
+      'correct': 'git init'
+    },
+    'What is the command to get the installed version of Git ?': {
+      'answers': ['git GetVersion', 'git --version', 'git help version'],
+      'correct': 'git --version'
+    },
+    'What is the command to commit with the message "New email" ?': {
+      'answers': ['git commit message "New email"','git commit -m "New email"','git commit --msg "New email"'],
+      'correct': 'git commit -m "New email"'
+    }
+  };
+  // initialize shuffled quiz
+  Map<String, Map> shuffledQuiz = {};
+
+  // create questions list and shuffle it
+  List questions = quiz.keys.toList();
+  questions.shuffle();
+
+  // loop over the questions, get each question answers and shuffle them too
+  for (int i = 0; i < quiz.length; i++) {
+    List answers = quiz[questions[i]]!['answers'];
+    answers.shuffle();
+    shuffledQuiz[questions[i]] = {
+      'answers': answers,
+      'correct': quiz[questions[i]]!['correct']
+    };
+  }
+  // return shuffled questions and answers
+  return shuffledQuiz;
+}

quiz_app/bin/menu.dart

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+import 'dart:io'; // library to interact with user
+
+// function to print menu and return user choice
+String menu() {
+  print('-'*36);
+  print("| ❓❔ WELCOME  TO  QUIZ  APP ❔❓ |");
+  print('-'*36);
+  print("|    Click 1 to start the quiz     |");
+  print("|         Click 0 to EXIT          |");
+  print('-'*36);
+  stdout.write("Enter a choice : ");
+  String? choice = stdin.readLineSync();
+  return choice!;
+}

quiz_app/bin/play.dart

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+// imports
+import 'dart:io';             // library to interact with user
+import 'get_questions.dart';  // function to get questions
+import 'play_again.dart';     // function to ask user for restart
+import 'end_message.dart';    // function to print suitable end of quiz message
+
+// function to start the quiz
+void play({required String name}) {
+  // initialize score
+  int score = 0;
+
+  Map<String, Map> quiz = getQuestions();
+
+  // quiz starts !!
+  print("⚔️  Hello $name, Get Ready ⚔️");
+
+  for (int i = 0; i < quiz.length; i++) {
+    // get question, answers, and correct answer
+    String question = quiz.keys.toList()[i];
+    List answers = quiz[question]!['answers'];
+    String correct = quiz[question]!['correct'];
+
+    // show question and answers
+    print('Q${i + 1} : $question\n');
+    print('1- ${answers[0]}');
+    print('2- ${answers[1]}');
+    print('3- ${answers[2]}');
+
+    // get user answer
+    stdout.write('\nchoose answer 1, 2, or 3 : ');
+    String? answer = stdin.readLineSync();
+
+    // validation
+    while (answer!.isEmpty ||
+        int.tryParse(answer) == null ||
+        (int.tryParse(answer) != null && ![1, 2, 3].contains(int.parse(answer)))) {
+      print("Invalid answer !!");
+      stdout.write('Please choose an answer 1, 2, or 3 : ');
+      answer = stdin.readLineSync();
+    }
+
+    // casting to int
+    int userAnswer = int.parse(answer);
+
+    // check answer by comparing it with the index of the correct answer
+    userAnswer - 1 == answers.indexOf(correct)
+        ? print("${answers[userAnswer-1]} is Correct ✅\nYour score now is ${++score}")
+        : print('${answers[userAnswer-1]} is Wrong ❌');
+    print('-' * 30);
+  }
+  print("The end 🏁");
+
+  // print suitable message after ending the quiz
+  print(endMessage(name: name, score: score, quiz: quiz));
+
+  // ask user to play again
+  playAgain(name: name, score: score);
+}

quiz_app/bin/play_again.dart

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+import 'dart:io';           // library to interact with user
+import 'play.dart';         // function to start quiz
+
+// function to ask user to play again
+void playAgain({required String name, required int score}) {
+  // ask user to play again
+  print('-'*30);
+  print("Play Again ?");
+  print("0 : No");
+  print("1 : Sure !");
+  print('-'*30);
+  stdout.write("Enter your choice : ");
+  String? choice = stdin.readLineSync();
+
+  // validation
+  while (choice!.isEmpty || !['0', '1'].contains(choice)) {
+    print("Invalid choice !!");
+    print("Play Again ?");
+    print("0 : No");
+    print("1 : Sure !");
+    stdout.write("Enter your choice : ");
+    choice = stdin.readLineSync();
+  }
+
+  // if yes call play(), otherwise end the program
+  choice == '0' ? print("Bye bye 🖐️ .....") : play(name: name);
+}

quiz_app/bin/quiz_app.dart

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+// imports
+import 'dart:io';   // library to interact with user
+import 'menu.dart'; // function to display menu
+import 'play.dart'; // function to start the quiz
+
+void main() {
+  while_quiz:
+  while (true) {
+    String choice = menu();
+    switch (choice) {
+      // EXIT
+      case '0':
+        print("Bye bye 🖐️ .....");
+        break while_quiz;
+
+      // play
+      case '1':
+        // get user name
+        stdout.write('Enter your name : ');
+        String? name = stdin.readLineSync();
+
+        // validation
+        while (name!.isEmpty || !name.contains(RegExp(r'[A-Za-z]'))) {
+          print('Invalid name !!');
+          stdout.write('Please enter your name : ');
+          name = stdin.readLineSync();
+        }
+        print('-'*30);
+        play(name: name);
+        break while_quiz;
+
+      default:
+        print("Invalid choice !!");
+    }
+  }
+}