e-Stone Information Technology Associate Consultant Interview Questions and Answers

Remove duplicate objects from an array of multiple objects.

• Create a new array to store unique objects

• Loop through the original array and check if the object already exists in the new array

• If not, add it to the new array

• Return the new array

Maintain state by using a global variable or a state management system.

• Use a global variable to store the state and access it whenever needed.

• Use a state management system like Redux or MobX to manage the state.

• Avoid using local variables or closures to store state as they will be lost when the code is repeated.

• Consider using object-oriented programming principles to encapsulate state within objects.

• Use functional prog...read more

Design patterns are reusable solutions to common software problems. Android system uses various design patterns.

• MVC (Model-View-Controller) pattern is used in Android to separate UI logic from business logic.

• Singleton pattern is used to ensure only one instance of a class is created.

• Observer pattern is used to notify changes in data to multiple components.

• Builder pattern is used to simplify complex object creation.

• Adap...read more

Collections are data structures that store and manipulate groups of objects.

• Collections provide a way to organize and manage large amounts of data.

• They can be used to store and manipulate objects of different types.

• Examples of collections include lists, sets, maps, and queues.

• Collections can be sorted, filtered, and searched to retrieve specific data.

• They are an essential part of many programming languages and framewor

Display the character and it's frequency in a string.

• Iterate through the string and count the frequency of each character using a dictionary or hashmap.

• Print the character and its frequency for each unique character in the string.

• Handle edge cases such as empty string or non-alphabetic characters.