Advanced Programming and Flutter Assessment
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Questions and Answers

Given the behavior of final and const in Dart, what scenario would cause a compilation error?

  • Trying to modify a `final` variable after it has been initialized at runtime.
  • Declaring a `final` variable without initializing it immediately.
  • Assigning a non-compile-time value to a `const` variable. (correct)
  • Using a `const` variable inside a constructor.

    • If code execution encounters an out-of-bounds index when accessing a list, what will be the result?

  • The compiler will throw an error.
  • The program will exit without any error.
  • The program will print a warning and continue.
  • The program will throw a runtime error. (correct)

    • Given that a for loop's condition uses the variable i, with an initial value of 0 and increments up to 3, what is the last value that will be printed?

  • It will not print at all.
  • 2 (correct)
  • 3
  • 4

    • What is the correct sequence of states in the example regarding fetching data?

    <p>Fetching...Done Data Fetched</p> Signup and view all the answers

    Using the removeWhere method on a list, and filtering based on odd numbers, what is the resulting output?

    <p>The odds numbers are removed.</p> Signup and view all the answers

    Which of the following best characterizes a Stream?

    <p>It is designed to handle multiple values sequentially over time.</p> Signup and view all the answers

    How do on and catch differ in error handling?

    <p><code>on</code> handles specific error types, while <code>catch</code> handles any error.</p> Signup and view all the answers

    What happens to the execution flow when an asynchronous operation is started but not awaited, and then the program finishes?

    <p>The async operation will complete, but may be unpredictable when it completes.</p> Signup and view all the answers

    What syntax defines an optional named parameter in a function definition?

    <p>Using curly braces around the parameter, such as <code>{int age}</code>.</p> Signup and view all the answers

    What happens when attempting to divide an integer by zero?

    <p>A 'Cannot divide by zero' runtime error is thrown.</p> Signup and view all the answers

    When does a factory constructor not return a new object instance?

    <p>It can return an existing object, based on some logic.</p> Signup and view all the answers

    How are nullable types indicated in Dart?

    <p>By appending <code>?</code> after the type.</p> Signup and view all the answers

    When overriding a method, which method is executed at runtime?

    <p>The method in the child class is executed.</p> Signup and view all the answers

    What occurs when a late variable is not initialized before it is accessed?

    <p>It causes a runtime error when the variable is accessed.</p> Signup and view all the answers

    In the context of future programming, what state is a future in while waiting for asynchronous operation?

    <p>Pending</p> Signup and view all the answers

    What is the correct method to create an immutable list?

    <p>Use the <code>const</code> keyword when creating the list.</p> Signup and view all the answers

    What is the main purpose of using a factory constructor over a regular constructor?

    <p>To allow object creation logic that can't be implemented in a regular constructor.</p> Signup and view all the answers

    What will the result of an integer division of $10 / 3$ be?

    <p>3</p> Signup and view all the answers

    Which Dart collection guarantees the uniqueness of its elements?

    <p>Set</p> Signup and view all the answers

    What is the role of typedef in Dart?

    <p>To define type aliases for function signature.</p> Signup and view all the answers

    In Flutter, what is the primary purpose of the build method within a widget class?

    <p>To construct the widget tree that represents the user interface.</p> Signup and view all the answers

    Which Flutter widget is specifically designed to display a scrollable list of items?

    <p><code>ListView</code></p> Signup and view all the answers

    What is the key distinction between StatelessWidget and StatefulWidget in terms of state management?

    <p><code>StatefulWidget</code> is capable of managing and updating its internal state, while <code>StatelessWidget</code> cannot.</p> Signup and view all the answers

    What are the commonly used methods for transferring data between different screens in a Flutter application?

    <p>Passing data through constructor parameters and using <code>Navigator</code> arguments.</p> Signup and view all the answers

    What is the primary function of the setState() method within a StatefulWidget?

    <p>To mark the widget tree as needing a rebuild based on changes in the state.</p> Signup and view all the answers

    Which widget is primarily used to capture and respond to user interactions (gestures) in Flutter?

    <p><code>GestureDetector</code></p> Signup and view all the answers

    How is the most common way to handle making HTTP requests for API calls in Flutter?

    <p>Utilizing the <code>http</code> package to send and receive data over the network.</p> Signup and view all the answers

    What is the main role of the Scaffold widget in the structure of a Flutter app?

    <p>It defines the basic structure and elements of the visual screen.</p> Signup and view all the answers

    What is the recommended way to create space or margin around a widget in Flutter?

    <p>By enclosing a widget with the <code>Padding</code> widget for configurable spacing.</p> Signup and view all the answers

    What is the purpose of the FutureBuilder widget in handling asynchronous operations in Flutter?

    <p>It is used to handle data returned from asynchronous operations to update the UI.</p> Signup and view all the answers

    Study Notes

    Advanced Programming and Flutter Assessment Questions

    • Q1: Dynamic variable x assigned the value 5, then assigned a string. Attempting to add a string to a number results in a runtime error. The output is a runtime error.

    • Q2: final is for runtime constants, while const is for compile-time constants. const values cannot be changed after initialization.

    • Q3: Attempting to modify a const list results in a compile-time error. The list is immutable (cannot be changed). The output is a runtime error.

    • Q4: This question requires the provided code to determine the output.

    • Q5: The code initializes a variable i to 0 and iterates while i is less than 5. It increments i in each iteration and prints the value of i unless i is equal to 3 (it continues in that case). The final output values are 1, 2, 4, and 5.

    • Q6: The print("Start"); statement executes, but return; statement is reached before print("End"); causing the second statement to not execute. The output is only "Start".

    • Q7: The correct way to define a function with optional parameters in Dart is using curly brackets and optional parameter as {int age}.

    • Q8: The code defines a function add that takes two integer arguments, calculates their sum, and returns the result. The function is called, with arguments in the body of the function and the output is 15.

    • Q9: A factory constructor in Dart can be used to dynamically create objects; it does not need to have a constructor.

    • Q10: A child class overrides a parent class method and the output is "Hello from Child"

    • Q11: The code fetches data and prints messages.The output is "Fetching...", "Data Fetched", then "Done". The "Data Fetched" is delayed by 2 seconds.

    • Q12: A Stream can handle multiple sequential values. It does not necessarily require await.

    • Q13: The on keyword handles specific types of errors, while the catch keyword handles any general error type.

    • Q14: Trying to divide by zero is caught and prints the message, "Cannot divide by zero".

    • Q15: Use a question mark ? to handle nullable types in Dart.

    • Q16: Using late on a variable without initialization causes a runtime error when the variable is accessed for its value.

    • Q17: Creating an immutable list in Dart is done using the const keyword.

    • Q18: The value of x is 10 and the result of modulo operation with 3 is 1. The code calculates the modulo of 10 divided by 3 and prints the result.

    • Q19: A Set in Dart is a collection that stores unique elements.

    • Q20: A typedef is used to create type aliases for function signatures.

    • Q21: The build method in a Flutter widget is responsible for building the widget tree.

    • Q22: A ListView widget is used to create a scrollable list in Flutter.

    • Q23: StatefulWidget manages state, while StatelessWidget does not.

    • Q24: Data can be passed between screens in Flutter using a constructor, global variables, or Navigator arguments.

    • Q25: The setState method in Flutter rebuilds the widget tree after a change in the state variable to reflect the changes.

    • Q26: A GestureDetector widget is used to handle user gestures in Flutter.

    • Q27: The http package is used to make API requests in Flutter.

    • Q28: The Scaffold widget is a structure for an app's layout.

    • Q29: The Padding widget is used to add padding around a widget.

    • Q30: FutureBuilder is used to handle asynchronous data and update the UI accordingly.

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    Programming and Flutter Assessment (30 Questions) PDF

    Description

    Test your knowledge on advanced programming concepts and Flutter with this assessment. The quiz covers topics like dynamic variables, constants, and code execution in Dart. Assess your understanding through practical questions designed to challenge your coding skills.

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