Krista Software Interview Questions and Answers

Q1. What are closures in js
Ans. 
Closures in JavaScript are functions that have access to variables from their outer scope even after the outer function has finished executing.
• Closures allow functions to access variables from their parent function even after the parent function has returned.

• They help in creating private variables and functions in JavaScript.

• Closures are created whenever a function is defined within another function.
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Q2. Output-based questions on let, var, const scope, and hoisting
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Q3. What is promise in js, async-await
Ans. 
Promises in JavaScript are objects representing the eventual completion or failure of an asynchronous operation.
• Promises are used to handle asynchronous operations in JavaScript.

• They can be in one of three states: pending, fulfilled, or rejected.

• Async-await is a syntactic sugar for working with promises in a more synchronous way.

• Async functions return a promise, which allows you to use the await keyword to pause execut...read more
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Q4. What is an event loop, and its significance
Ans. 
Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.
• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows for non-blocking execution of code, ensuring that the program remains responsive.

• Event loop continuously checks the call stack and the task queue, moving tasks from the queue to the stack when the stack is empty.

• Exampl...read more
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Q5. Difference b/w angular and react
Ans. 
Angular is a full-fledged framework with more features and conventions, while React is a library focused on UI components.
• Angular is a full-fledged framework with built-in features like routing, forms, and HTTP client, while React is a library focused on building UI components.

• Angular uses two-way data binding, where changes in the model automatically reflect in the view and vice versa, while React uses one-way data fl...read more
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Q6. And many more question like these
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1. Given a string of words, show the count of words
2. Valid parentheses problem ({[]}) -> true
3. oops concepts -> static variable ? how to declare and access a static variable

Q1. System design question.
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Q2. Js basic questions
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Content of aptitude test: logical, verbal, english, program mcq

Coding test is not very hard but do practice on daily basis.

Q1. Explain SDLC. Tell me test cases on T. V What is your short term goal? What is your long term goal?
Ans. 
SDLC is a process followed for software development. Test cases for T.V. include image quality, sound quality, remote control functionality, etc. Short term goal is to learn new skills. Long term goal is to become a team lead.
• SDLC is Software Development Life Cycle

• It includes planning, designing, coding, testing, and maintenance

• Test cases for T.V. include checking image and sound quality, remote control functionality, ...read more
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