Ivy Mobility Solutions Senior Engineer 3 Interview Questions and Answers

Q1. Explain even loop
Ans. 
An event loop is a programming construct that waits for and dispatches events or messages in a program.
• The event loop continuously checks for events and executes associated callbacks.

• It allows non-blocking I/O operations, enabling efficient handling of multiple tasks.

• In JavaScript, the event loop is crucial for asynchronous programming, managing tasks like API calls.

• Example: In a web browser, the event loop handles use
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Q2. Explain how redux works
Ans. 
Redux is a predictable state container for JavaScript apps, enabling centralized state management and unidirectional data flow.
• Centralized Store: Redux maintains a single store that holds the entire state of the application.

• Actions: Actions are plain JavaScript objects that describe changes to the state. Example: { type: 'ADD_TODO', payload: 'Learn Redux' }

• Reducers: Reducers are pure functions that take the current sta...read more
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Q1. Cognos related questions
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Q2. Cloud related questions
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Q1. Java Basics like jdk, jre, core java questions
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Q2. Merge sort
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Q1. Asked About Xamarin Binding
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Q2. Layout optimisation in Xamarin forms
Ans. 
Layout optimisation in Xamarin forms involves improving performance and user experience by efficiently arranging UI elements.
• Use ListView instead of StackLayout for long lists to improve performance.

• Avoid nesting multiple layouts within each other to reduce complexity.

• Utilize Grid layout for more complex UI designs.

• Use RelativeLayout for positioning elements relative to each other.

• Implement caching mechanisms for frequ
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Q3. Unit tesing Difference between Test and TestCase attribute
Ans. 
Test attribute is used to define a test method, while TestCase attribute is used to define a test case class.
• Test attribute is used to mark a method as a test method in a test class.

• TestCase attribute is used to mark a class as a test case class containing multiple test methods.

• Test attribute is used in frameworks like NUnit, JUnit, etc.

• TestCase attribute is used in frameworks like NUnit, JUnit, etc.
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Q4. About Polymorphism
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Q1. Program to find the largest and smallest integer in a program
Ans. 
Program to find the largest and smallest integer in a program
• Iterate through the array of integers to find the largest and smallest values

• Initialize variables to store the largest and smallest values, update them as needed

• Handle edge cases like empty array or array with only one element

• Return the largest and smallest values found
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Q2. Explain internal working of HashMap, what is abstract class
Ans. 
HashMap is a data structure that stores key-value pairs using hashing. An abstract class is a class that cannot be instantiated.
• HashMap uses hashing to store key-value pairs for efficient retrieval.

• Abstract classes cannot be instantiated and can have abstract methods that must be implemented by subclasses.

• Example: HashMap map = new HashMap<>();
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Q1. Which list you will prefer using if you want to create an application that needs constant modification, ArrayList or LinkedList
Ans. 
LinkedList is preferred for constant modification due to faster insertion and deletion times.
• LinkedList is preferred for constant modification because it has faster insertion and deletion times compared to ArrayList.

• LinkedList allows for easy insertion and deletion of elements without the need to shift other elements, making it more efficient for constant modifications.

• ArrayList is better for random access and iteratin...read more
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Q1. Explain about distributed system design
Ans. 
Distributed system design involves breaking down a system into smaller components that communicate and coordinate with each other over a network.
• Decompose the system into smaller services that can run independently

• Use messaging protocols like MQTT or AMQP for communication

• Implement fault tolerance and scalability measures

• Consider data consistency and synchronization across nodes

• Examples: microservices architecture, Apa
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Q2. Make an class with other objects as immutable
Ans. 
Create a class with other objects as immutable
• Use final keyword to make class immutable

• Make all fields private and final

• Do not provide setter methods, only getter methods

• If class contains mutable objects, make sure to return a copy of them in getter methods
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Had a aptitude + coding on round 1.

Q1. Had a coding + Techincal interview ok Java springboot
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Q1. There was coding question puzzle and technical discussion
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Q1. Ot was techno managineial round. Java concepts and puzzles and managerial questions were asked
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Q1. This was director round.It was short for 20mnts. A design question and few managerial questions were asked
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Q1. It was an hR discussion where salary and benefits were discussed
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