Deqode Softwaretest Engineer Interview Questions and Answers

Q1. What is the D/W Rest and GraphQL APIS?
Ans. 
D/W Rest and GraphQL APIs are two different types of APIs used for communication between software systems.
• D/W Rest API is a standard protocol for accessing and manipulating data over the web using HTTP.

• GraphQL API is a query language for APIs and a runtime for executing those queries with your existing data.

• Rest APIs are more commonly used and follow a stateless client-server architecture.

• GraphQL APIs allow clients to ...read more
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Q2. REST uses fixes endpoint;..............etc.
Ans. 
REST uses fixed endpoints to define the resources that can be accessed through the API.
• RESTful APIs use fixed URLs to access resources

• Each endpoint corresponds to a specific resource or action

• Endpoints are defined in the API documentation

• Example: GET /users retrieves a list of users
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Q1. Difference between overload and override
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Overload is when a class has multiple methods with the same name but different parameters. Override is when a subclass provides a specific implementation of a method that is already defined in its superclass.
• Overload occurs within the same class, while override occurs between a superclass and its subclass.

• Overload is resolved at compile time based on the method signature, while override is resolved at runtime based on ...read more
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Q2. What is split functions
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Split functions are used to divide a string into multiple parts based on a specified delimiter.
• Split functions are commonly used in programming languages like Python, JavaScript, and Java.

• The split function takes a string and splits it into an array of substrings based on a specified delimiter.

• For example, in Python, the split function can be used like this: 'hello world'.split(' ') will return ['hello', 'world'].
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Q3. Data structure questions
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Q4. Html css basics
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Q5. Python program question
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Reasoning, mathematics, and basic English grammar.

Q1. Self introduction, domain knowledge, some questions about Test case presentation.
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Q1. Interview in python technologies tela vent also
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Q2. Great experience at the moment
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Q1. Great experience at This company
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Q2. Great experience on technical training interview
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Q1. SQL,c programming,Java
Ans. SQL where and having ,a c programming question
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Q1. Rate yourself in js, node js, react, MongoDB (separately)
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Q2. Typeof null, typeof undefined, typeof {}, typeof NaN
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Q3. What changes came in es6
Ans. 
ES6 introduced several new features and improvements to JavaScript, making it more powerful and efficient.
• Arrow functions for more concise syntax

• Let and const for block-scoped variables

• Classes for easier object-oriented programming

• Template literals for easier string interpolation

• Default parameters and rest parameters for function arguments

• Destructuring assignment for easier data extraction

• Promises for asynchronous prog
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Q4. This keyword, closures, hoisting
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Q5. Are let and cont variables hoisted?
Ans. 
Yes, let and const variables are hoisted but not initialized.
• let and const variables are hoisted to the top of their block scope, but they are not initialized until the actual line of code is executed.

• This means that you cannot access a let or const variable before it is declared in the code.

• For example, trying to access a let variable before it is declared will result in a ReferenceError.
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Q6. What is global context
Ans. 
Global context refers to the overall environment or setting in which something exists or operates.
• Global context encompasses all variables, functions, and objects that are accessible throughout an entire program.

• It can be thought of as the 'big picture' view of a program's execution.

• In web development, global context includes the window object in JavaScript.
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Q7. What is temporal deadzone
Ans. 
Temporal dead zone is a period during the variable creation process where accessing the variable results in a ReferenceError.
• Occurs when trying to access a variable before it has been declared with let or const

• Happens due to the variable being in the temporal dead zone until it is declared

• Example: accessing a variable before its declaration will result in a ReferenceError
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Q8. What is modules? types of modules in nodejs
Ans. 
Modules in Node.js are reusable blocks of code that encapsulate related functionality.
• Modules in Node.js can be built-in modules like fs (file system) or third-party modules like express.

• Modules help in organizing code into separate files for better maintainability and reusability.

• Modules can be imported using the require() function in Node.js.
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Q9. Index in mongodb, why we need index, is index good or bad?
Ans. 
Indexes in MongoDB improve query performance by allowing the database to quickly locate and retrieve specific documents.
• Indexes help to speed up query performance by allowing the database to quickly locate specific documents based on the indexed fields.

• Without indexes, MongoDB would have to perform a collection scan, which can be slow and resource-intensive.

• Indexes can be created on single fields or compound fields to ...read more
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Q10. What are hooks , use of useRef
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Hooks are a feature in React that allow you to use state and other React features in functional components. useRef is a hook that allows you to create a mutable object that persists for the lifetime of the component.
• Hooks are used to add state and lifecycle methods to functional components in React

• useRef is used to create a mutable reference that persists between renders

• useRef can be used to access DOM elements directl
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Q11. Fs module, http module, worker thread?
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Q12. Why we use mongoose not mongodb driver?
Ans. 
Mongoose is an Object Data Modeling (ODM) library for MongoDB that provides a higher level of abstraction and simplifies interactions with the database.
• Mongoose provides schema validation which helps maintain data integrity.

• Mongoose simplifies querying and data manipulation with built-in functions.

• Mongoose supports middleware functions for pre and post processing of data operations.
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Q1. Diff btw vite and webpack
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Q2. What is currying in js
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Q1. What is currying in javascript?
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Q2. Diff btw webpack and vite
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The aptitude test evaluates problem-solving, coding skills, and logical reasoning, offering a fair challenge to showcase technical expertise.

Q1. How do you handle conflicts in a team project?
Ans. 
I address conflicts in team projects by promoting open communication, active listening, and seeking compromise.
• Encourage open communication among team members to address conflicts early on

• Practice active listening to understand all perspectives and concerns

• Seek compromise and find common ground to resolve conflicts effectively
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Q2. What is the difference between an interface and an abstract class?
Ans. 
Interface is a contract that defines the methods a class must implement, while an abstract class can have both implemented and abstract methods.
• Interface can only have abstract methods and cannot have any implementation, while abstract class can have both abstract and implemented methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used to achieve multiple inheri...read more
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