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10+ HyScaler Apprentice Interview Questions and Answers

Updated 12 Aug 2024

Q1. How to choose right database for your project.

Ans.

Choose database based on project requirements, scalability, performance, and budget.

  • Consider the type of data you will be storing (structured, unstructured, semi-structured)

  • Evaluate the scalability requirements of your project

  • Assess the performance needs of your application

  • Take into account the budget constraints for the project

  • Consider the level of expertise available for managing the database

  • Examples: MySQL for small-scale projects, MongoDB for unstructured data, PostgreSQL...read more

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Q2. What is css specificity?

Ans.

CSS specificity determines which style rule is applied to an element when multiple rules have conflicting selectors.

  • Specificity is calculated based on the type of selector used in a CSS rule.

  • Inline styles have the highest specificity, followed by IDs, classes, and elements.

  • Using !important in a rule increases its specificity, but should be used sparingly.

  • Specificity is important to understand when troubleshooting CSS styling issues.

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HyScaler Apprentice Interview Questions and Answers for Freshers
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Q3. Difference between Normal Function and arrow function.

Ans.

Normal functions are defined using the function keyword, while arrow functions are defined using the => syntax.

  • Normal functions are hoisted, while arrow functions are not.

  • Arrow functions do not have their own 'this' keyword, they inherit it from the parent scope.

  • Arrow functions are more concise and have implicit return.

  • Arrow functions cannot be used as constructors.

  • Example: const normalFunction = function() {}; const arrowFunction = () => {};

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Q4. What is docker and its commands?

Ans.

Docker is a platform for developing, shipping, and running applications using containerization technology.

  • Docker is used to create, deploy, and run applications in containers.

  • Some common Docker commands include 'docker run' to run a container, 'docker build' to build an image, and 'docker push' to push an image to a registry.

  • Docker containers are lightweight, portable, and isolated environments that package an application and its dependencies.

  • Docker images are read-only templ...read more

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Q5. What is closure in javascript?

Ans.

Closure in JavaScript is the combination of a function and the lexical environment within which that function was declared.

  • Closure allows a function to access variables from its outer scope even after the outer function has finished executing.

  • It is created whenever a function is defined within another function, and the inner function has access to the outer function's variables.

  • Example: function outerFunction() { let outerVar = 'I am outer'; function innerFunction() { console...read more

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Q6. Why docker is useful?

Ans.

Docker is useful for containerization, allowing for easy deployment and scaling of applications.

  • Docker allows for consistent environments across development, testing, and production.

  • It improves efficiency by reducing the time and effort needed to set up and configure environments.

  • Containers can be easily moved between different hosts, making deployment and scaling simpler.

  • Docker enables microservices architecture, breaking down applications into smaller, manageable components...read more

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Q7. What is react state management

Ans.

React state management is a way to manage and update the state of components in a React application.

  • State management helps in storing and updating data within components.

  • React provides built-in state management using the useState hook.

  • For more complex state management, libraries like Redux or Context API can be used.

  • State management helps in keeping the UI in sync with the data changes.

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Q8. What is Docker?

Ans.

Docker is a platform for developing, shipping, and running applications in containers.

  • Docker allows developers to package applications and their dependencies into containers.

  • Containers are lightweight, portable, and isolated environments that can run on any system.

  • Docker simplifies the process of building, deploying, and scaling applications.

  • Example: Running a web server in a Docker container.

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Q9. What is Callback?

Ans.

Callback is a function that is passed as an argument to another function and is executed after the completion of that function.

  • Callback functions are commonly used in asynchronous programming to handle tasks that take time to complete.

  • Examples include event listeners in web development, setTimeout function in JavaScript, and AJAX requests.

  • Callbacks can be synchronous or asynchronous depending on the programming language and context.

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Q10. What is Closures

Ans.

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

  • Closures allow functions to 'remember' variables from their outer scope

  • They are commonly used in event handlers and callbacks

  • Closures help in creating private variables in JavaScript

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Q11. Closure in javascript?

Ans.

Closure in JavaScript allows a function to access variables from its outer scope even after the outer function has finished executing.

  • Closure is created when a function is defined within another function and has access to the outer function's variables.

  • The inner function can access and modify the outer function's variables even after the outer function has returned.

  • Closure is commonly used to create private variables and functions in JavaScript.

  • Example: function outerFunction...read more

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Q12. Garbage collector in java

Ans.

Garbage collector in Java is responsible for automatically managing memory by reclaiming unused objects.

  • Garbage collector runs in the background to reclaim memory from objects that are no longer in use.

  • It helps prevent memory leaks and optimize memory usage.

  • Examples of garbage collectors in Java include Serial, Parallel, CMS, G1, and Z Garbage Collector.

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Interview Process at HyScaler Apprentice

based on 27 interviews
5 Interview rounds
Coding Test Round
Assignment Round
Technical Round - 1
Technical Round - 2
HR Round
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