Flutter & Dart Test

Dinance is a crypto finance mobile app. The app is built using Flutter and uses Sliders at multiple places. Review the following two snippets of Sliders used in the app. How will the Sliders be displayed?

A: Slider X is displayed as a continuous slider with values {0.0, 0.25, 0.5, 0.75, 1.0}
B: Slider X is displayed as a discrete slider with values {0.0, 0.25, 0.5, 0.75, 1.0}
C: Slider X is displayed as a discrete slider with values {0.0, 0.33, 0.67, 1.0}
D: Slider X is displayed as a discrete Slider with the values {0.0, 1.0, 2.0, 3.0, 4.0}

E: Slider Y is displayed as a discrete Slider with the thumb rightmost
F: Slider Y is displayed as a continuous Slider with thumb leftmost
G: Slider Y is displayed as a discrete Slider with values {0.0, 0.25, 0.5, 0.75, 1.0} with thumb left most
H: Slider Y is displayed as a continuous Slider with thumb rightmost

Review the following Flutter code:

The code produces the following UI:

What will the UI look like if we add following properties to Wrap widget (after line 29):

textDirection: TextDirection.rtl
direction: Axis.vertical

Consider the below code:

Analyze the given pseudocode and determine what will be displayed on the screen after the second emission of Stream (after 2 seconds).

A: CircularProgressIndicator will be displayed.
B: A ListView with 3 ListTile widgets, each displaying one item from the list ['Item1', 'Item2', 'Item3'].
C: Text widget with 'No Items Available' will be displayed.
D: A ListView with 0 ListTile widgets.
E: The code will throw an error.

Consider the following pseudocode:

Review the pseudocode. What will be the output in the console when the application starts, the user clicks the 'Navigate' button to navigate to AnotherScreen and then navigates back to the ParentWidget?

In a Flutter application, you are using the firebase_messaging package to handle incoming FCM (Firebase Cloud Messaging) push notifications. Consider the pseudocode below:

In the _handleNotification method, the application is supposed to navigate to a details page if the action key in the notification data is equal to 'navigate'. However, this might not work as expected if the app is in the background or terminated state when the notification is received and the user clicked on it.

How would you modify the _handleNotification method or handle the onMessage event to ensure that the navigation occurs when the user taps on the notification to open the app, no matter what state the app is in when the notification is received?

A: Use _firebaseMessaging.onMessageOpenedApp to handle navigation when the user taps the notification to open the app.
B: Use _firebaseMessaging.onLaunch to handle the navigation when the user taps the notification.
C: Check the message.messageType and navigate only if it is 'opened'.
D: Use _firebaseMessaging.onBackgroundMessage for handling navigation when the app is in the background.
E: Use a GlobalKey<NavigatorState> to handle navigation in _handleNotification.

Review the following Dart code:

The code reads data from a file synchronously. The code blocks while waiting for file I/O. Which of the following is the proper asynchronous version of the same code? 

- Assume readAsString is asynchronous version of readAsStringSync
- Lines with changes compared to original code are marked with // #

What would the following Dart code print?

Consider the following Dart code:

What will be the output of the above Dart code?

We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount.

For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition.

⚠️⚠️⚠️ Note:
- The first line of the input is the length of the array. The second line contains all the elements of the array.
- The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function.
- You need to "print" the final result (not return it) to pass the test cases.

For the example discussed above, the input will be:
5
20 70 -40 30 -10

Your code needs to print the following to the standard output:
20 70 30 -40 -10

A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. 

Example:

Input:
WWMMWWCCC

Expected Output: 
4W3C2M

Explanation: 
‘W’ has the highest count, then ‘C’, then ‘M’. 

⚠️⚠️⚠️ Note:
- The input is already parsed and passed to a function.
- You need to "print" the final result (not return it) to pass the test cases.
- If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’.
- If any of them have the same count, the output should follow this order - M, W, C.