MiM-Essay Front end Developer Interview Questions and Answers

Online MCQ test focusing on react, javascript and fundamentals

Q1. What is a closure in javascript
Ans. 
A closure in JavaScript is a function that has access to its own scope, as well as the scope in which it was defined.
• A closure allows a function to access variables from an outer function even after the outer function has finished executing.

• Closures are commonly used to create private variables and functions in JavaScript.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() {
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Q2. 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: Fetching data from an API returns a promise that resolves with the data or rejects with an erro
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Q1. Reverse a string
Ans. 
Reverse a given string
• Use built-in functions like reverse() or split() and join()

• Iterate through the string from end to beginning and build a new reversed string

• Implement a recursive function to reverse the string
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