10+ Interview Questions and Answers

Reverse Sting in js means reversing the characters in a string.

• Use the split() method to split the string into an array of characters

• Use the reverse() method to reverse the order of the characters

• Use the join() method to join the characters back into a string

Runnable is a functional interface used for running a task, while Callable is a functional interface used for returning a result.

• Runnable does not return a result and cannot throw checked exceptions, while Callable can return a result and throw checked exceptions.

• Callable interface is a generic interface that returns a result, while Runnable interface does not return a result.

• Example: Runnable interface is commonly used with the Thread class to run tasks in a separate thread,...read more

Create a tab section using JavaScript

• Use HTML and CSS to create the tab structure

• Use JavaScript to handle the tab functionality

• Add event listeners to the tab elements to switch between tabs

Thread safety in Java refers to the ability of a piece of code to function correctly during simultaneous execution by multiple threads.

• Thread safety is important in multi-threaded environments to prevent race conditions and ensure data consistency.

• Synchronization mechanisms like synchronized blocks, locks, and atomic variables can be used to achieve thread safety.

• Example: Using synchronized keyword to ensure only one thread can access a critical section of code at a time.

Association and composition are two types of relationships between classes in object-oriented programming.

• Association is a relationship where two classes are related in some way, but can exist independently. For example, a teacher and a student are associated as a teacher can teach multiple students.

• Composition is a stronger form of association where one class is composed of one or more other classes. For example, a car is composed of an engine, wheels, and other components.

• I...read more

Yes, I have worked on e-commerce websites in the past.

• Managed major incidents related to e-commerce website downtime or performance issues

• Coordinated with cross-functional teams to resolve issues quickly and minimize impact on customers

• Implemented incident management best practices to prevent future incidents

• Used monitoring tools to proactively identify potential issues before they impact customers

Inheritance is a mechanism in object-oriented programming where a new class is created from an existing class.

• It allows the new class to inherit the properties and methods of the existing class.

• The existing class is called the parent class or superclass, and the new class is called the child class or subclass.

• The child class can add new properties and methods or override the ones inherited from the parent class.

• Inheritance promotes code reuse and makes it easier to maintain a...read more

Closures are functions that have access to variables from their outer scope, even after the outer function has finished executing.

• Closures are created when a function is defined inside another function.

• The inner function has access to the outer function's variables, even after the outer function has returned.

• Closures are useful for creating private variables and data encapsulation.

• They can be used to implement callback functions and maintain state in asynchronous operations.

OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects.

• OOPs focuses on creating objects that contain both data and functions to manipulate that data.

• It emphasizes on encapsulation, inheritance, and polymorphism.

• Encapsulation is the process of hiding the implementation details of an object from the outside world.

• Inheritance allows a class to inherit properties and methods from another class.

• Polymorphism allows objects of different classes ...read more

Thread synchronization in Go ensures safe access to shared resources by preventing race conditions.

• Use channels to communicate between goroutines and synchronize access to shared data

• Use sync package for more complex synchronization mechanisms like mutexes and wait groups

• Avoid using global variables for shared data to prevent race conditions

Event loop is a mechanism in programming that allows for asynchronous execution of code by continuously checking for and handling events.

• Event loop continuously checks for events in a queue and executes associated callback functions

• It allows for non-blocking I/O operations in programming languages like JavaScript

• Event loop is essential for handling user interactions and network requests asynchronously

• Example: In JavaScript, the event loop is responsible for handling events li...read more