Nine Hertz Interview Questions and Answers

Sorting an array involves arranging its elements in a specific order, typically ascending or descending.

• Use built-in functions like sort() in Python: e.g., sorted(['banana', 'apple', 'cherry']) returns ['apple', 'banana', 'cherry'].

• For custom sorting, provide a key function: e.g., sorted(['banana', 'apple', 'cherry'], key=len) sorts by string length.

• Consider sorting algorithms like QuickSort or MergeSort for manua...read more

Activity and Fragment lifecycle manage UI states and transitions in Android apps, ensuring efficient resource use.

• Activity Lifecycle: onCreate(), onStart(), onResume(), onPause(), onStop(), onDestroy(). Example: onCreate() initializes UI.

• Fragment Lifecycle: onAttach(), onCreateView(), onActivityCreated(), onStart(), onResume(), onPause(), onStop(), onDestroyView().

• onPause() is called when the Activity or Fragment ...read more

Widget tree is a hierarchical structure of widgets in Flutter representing the UI components.

• Widget tree is a collection of nested widgets that define the UI layout.

• Each widget in the tree represents a UI component like buttons, text, images, etc.

• Widgets are arranged in a parent-child relationship, forming a tree-like structure.

• Changes in the widget tree trigger UI updates and rebuilds.

• Example: MaterialApp contain...read more

State management is the process of managing and updating the state of an application to ensure data consistency and user interface responsiveness.

• State management involves handling the data that an application needs to display and interact with.

• It helps in keeping track of changes in the application's state and updating the user interface accordingly.

• There are various state management solutions available in Flutte...read more

Test cases for login and sign up

• Verify successful login with valid credentials

• Verify error message displayed for invalid credentials

• Verify user is redirected to correct page after login

• Verify successful sign up with valid details

• Verify error message displayed for invalid details

• Verify user is redirected to correct page after sign up