10+ TechMojo Solutions 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

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

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

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

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.

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

Design a payment gateway similar to ccavenues.

• Implement secure payment processing

• Support multiple payment methods like credit/debit cards, net banking, wallets, etc.

• Provide seamless integration with e-commerce platforms

• Offer fraud protection and risk management features

• Ensure PCI DSS compliance

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