Mfine Reactjs Developer Interview Questions and Answers

Q1. What are promises
Ans. 
Promises 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.

• Example: fetch() API returns a promise that resolves with the response to a request.
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Q2. How js handle asynchronous codes
Ans. 
JavaScript handles asynchronous codes using callbacks, promises, and async/await.
• Callbacks are functions passed as arguments to another function to be executed later.

• Promises represent the eventual completion (or failure) of an asynchronous operation and allow chaining of multiple asynchronous operations.

• Async/await is a modern way of handling asynchronous code that makes it look synchronous.

• Example: Using setTimeout w...read more
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Q3. Stair climbing leetcode question
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DSA ,Algorithm, OOPS, all types of questions asked