ZeroCodeHR Senior Database Developer Interview Questions and Answers

Q1. Promises in javascript
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.

• Promises can be chained using .then() to handle success and .catch() to handle errors.
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Q1. Resume based questions
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Q2. Event loop in nodejs
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Event loop in Node.js manages asynchronous operations by executing callback functions when certain events occur.
• Event loop is responsible for handling I/O operations, timers, and callbacks in Node.js

• It allows Node.js to perform non-blocking operations efficiently

• Event loop continuously checks the event queue for new events to execute
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Q3. Javascript es6 questions
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The test was very weird one.
They did have planned anything for the test, They came and given a link on bit.ly and given an another link that is in google form for the answers.
And they selection of people for second round is not sensible.

This round was also be a weird.
They give each candidates with different questions.
They told us to write logic on the paper and you can use internet for your reference.
But after this round they announced the results but that is not in genuine one.

Q1. Basic dsa questions predict output
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Medium level problem,

Q1. Based on resume
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45 min apps and technical question

45 min coding round you can refer net for first 15 min

Q1. Tell Me about yourself
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Q2. What is C# and coding.
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Q1. What is your CCTC?
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Q1. What is useState?
Ans. 
useState is a hook in React that allows functional components to have state.
• useState is a React hook used in functional components to manage state.

• It returns an array with the current state value and a function to update that value.

• Example: const [count, setCount] = useState(0);
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Q2. What's useEffect?
Ans. 
useEffect is a hook in React that allows performing side effects in function components.
• Used in React functional components to perform side effects

• Executes after render and after every update

• Can be used to fetch data, subscribe to events, update the DOM, etc.
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Q3. What is Redux and state management?
Ans. 
Redux is a predictable state container for JavaScript apps. It helps manage the state of an application in a centralized way.
• Redux is a state management library commonly used with React.

• It allows for a single source of truth for the state of an application.

• Actions are dispatched to update the state, and reducers specify how the state changes in response to actions.

• Redux DevTools can be used to track state changes and d...read more
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2 hrs Python and aptitude

Q1. DSA questions with optimized solutions
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