10+ Dr. Reddy's Interview Questions and Answers

Node.js is a runtime environment that allows you to run JavaScript on the server side.

• Node.js is built on Chrome's V8 JavaScript engine.

• It uses an event-driven, non-blocking I/O model.

• Node.js is commonly used for building web applications and APIs.

• Popular frameworks for Node.js include Express and Koa.

Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.

• Dependency injection helps in achieving loose coupling between classes.

• It allows for easier testing by providing a way to mock dependencies.

• There are three types of dependency injection - constructor injection, setter injection, and interface injection.

Inheritance is a concept in object-oriented programming where a class inherits attributes and methods from another class.

• Allows a class to inherit properties and behaviors from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Derived class can access public and protected members of the base class

• Example: class Car inherits from class Vehicle

Polymorphism is the ability of a single function or method to operate on different types of data.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: a superclass Animal with subclasses Dog and Cat. Both Dog and Cat can be treated as Animals.

Goroutines are lightweight threads managed by the Go programming language.

• Goroutines allow concurrent execution of functions

• They are multiplexed onto multiple OS threads by the Go runtime

• They are more efficient than traditional threads due to lower memory footprint and faster startup time

Components can communicate through various methods like props, events, and state.

• Components can pass data through props from parent to child components.

• Events can be used to trigger actions in other components.

• State can be used to manage data within a component and can be passed down through props.

• Context API can be used to share data between components without having to pass props down through every level of the component tree.

Directives are markers on a DOM element that tell AngularJS to attach a specified behavior to that element.

• Directives are used to create custom HTML tags that serve as new, reusable widgets.

• They can be used to manipulate the DOM, add event listeners, and create two-way data bindings.

• Examples of built-in directives include ng-model, ng-repeat, and ng-show.

• Directives can be restricted to only apply to elements, attributes, classes, or comments.

• They can also be used to create an...read more

MVC stands for Model-View-Controller, a software design pattern used to separate the application logic into three interconnected components.

• Model represents the data and business logic of the application

• View is responsible for displaying the data to the user

• Controller acts as an intermediary between Model and View, handling user input and updating the Model accordingly

In Golang, inheritance is implemented using composition instead of traditional inheritance.

• Golang does not support traditional inheritance like other object-oriented languages.

• Instead of inheritance, Golang promotes code reuse through composition.

• Embedding structs in Golang allows for achieving similar behavior to inheritance.

Memory management is the process of controlling and coordinating computer memory, assigning portions called blocks to various programs.

• Memory management involves allocating memory to programs when needed

• It also involves deallocating memory when it is no longer needed

• Memory management helps prevent memory leaks and optimize memory usage

• Examples include dynamic memory allocation in C/C++ using functions like malloc() and free()

Memory management in Python involves automatic memory allocation and deallocation through garbage collection.

• Python uses automatic memory management, meaning developers do not need to manually allocate or deallocate memory.

• Python's garbage collector automatically reclaims memory by detecting and removing objects that are no longer in use.

• Memory leaks can still occur in Python if circular references are not properly handled.

• Using tools like memory profilers can help identify a...read more

pytest is a powerful Python testing framework.

• pytest provides a simple and intuitive way to write tests.

• It supports test discovery, fixtures, parameterization, and test execution.

• pytest allows for easy integration with other testing tools and frameworks.

• It has a rich set of plugins and extensions for additional functionality.

• pytest supports running tests in parallel for faster execution.

• It generates detailed test reports and supports test coverage analysis.

Implement a code sorting algorithm for an array of strings.

• Use built-in sorting functions like sort.Strings() in Go.

• Implement custom sorting functions using interfaces like sort.Interface.

• Consider the time complexity of the sorting algorithm used.

Common libraries used in testing include JUnit, TestNG, Selenium, Appium, and RestAssured.

• JUnit

• TestNG

• Selenium

• Appium

• RestAssured