Remote Senior Front End Engineer Interview Questions and Answers

It was based on Javascript. Some web basics like CORS , react rendering patterns. Then JS based output questions. Some were based on JS promise. Function currying.

Question are very tough and faad

Question like trees linked list and graphs

Q1. Polyfill for bind Closures Call apply bind let const var lexical environment scope output questions
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Q1. What is denbouncer and throttle
Ans. 
Debouncer and throttle are techniques used to limit the frequency of function calls.
• Debouncing delays the execution of a function until a certain amount of time has passed without the function being called again.

• Throttling limits the frequency of function calls to a certain rate, executing the function at fixed intervals.

• Debouncing is useful for events that may be triggered multiple times in quick succession, such as r...read more
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Q2. What is curry function
Ans. 
Currying is a technique of transforming a function that takes multiple arguments into a sequence of functions that each take a single argument.
• Currying allows partial application of a function

• It helps in creating reusable functions

• Curried functions are easier to compose and chain

• Example: const add = (a) => (b) => a + b; add(2)(3) returns 5
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Q3. Implement curry function
Ans. 
Curry function is a higher-order function that allows partial application of arguments.
• Currying transforms a function that takes multiple arguments into a series of functions that take one argument each.

• It returns a new function until all the arguments are received and then executes the original function.

• Example: const add = (a, b) => a + b; const curriedAdd = curry(add); curriedAdd(2)(3) returns 5.
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Q4. What is promise.all()
Ans. 
promise.all() is a method that takes an array of promises and returns a new promise that resolves when all promises in the array have resolved.
• It is used to handle multiple asynchronous operations simultaneously.

• If any of the promises in the array rejects, the returned promise will be rejected with the reason of the first rejected promise.

• The resolved values of the promises are returned as an array in the same order as
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Q5. What is memoization?
Ans. 
Memoization is a technique of caching the results of a function to improve performance.
• Memoization is used to avoid redundant calculations by storing the results of a function and returning the cached result when the same inputs occur again.

• It is commonly used in recursive functions and functions with expensive computations.

• Memoization can be implemented manually or by using libraries like Lodash or Memoizee.

• Example: M...read more
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Q6. What is closure in javascript
Ans. 
Closure is a function that has access to its parent scope even after the parent function has returned.
• Closure allows for private variables and functions in JavaScript.

• It is created when a function returns another function.

• The inner function has access to the outer function's variables and parameters.

• Example: function outer() { let x = 10; return function inner() { console.log(x); } }

• The inner function can access and mo...read more
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Q7. What is the problem with colosures
Ans. 
Closures can cause memory leaks if not handled properly.
• Closures can hold references to variables outside of their scope, preventing them from being garbage collected.

• If closures are used excessively or not released properly, they can cause memory leaks.

• To avoid memory leaks, make sure to release closures when they are no longer needed.
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Q8. Some output questions on SetTimeout to check closure knowledge
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Q9. React lifecycle events
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Q10. Major difference between class based components and class based components
Ans. 
There is no difference between class based components and class based components.
• There seems to be a typo in the question.

• Assuming the question is about functional components vs class components, the major difference is that class components use a class to define the component while functional components are defined as functions.

• Class components have access to lifecycle methods while functional components do not.

• Functi...read more
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Q11. Shallow copy vs deep copy
Ans. 
Shallow copy only copies the reference to an object while deep copy creates a new object with a new memory address.
• Shallow copy is faster and uses less memory than deep copy.

• In shallow copy, changes made to the original object will reflect in the copied object as well.

• Deep copy creates a completely new object with its own memory space.

• In JavaScript, arrays and objects are assigned by reference, so a shallow copy will o...read more
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Q12. How to do deep copy ?
Ans. 
Deep copy creates a new object with the same values as the original object.
• Use Object.assign() method to create a deep copy of an object.

• For nested objects, use recursion to copy all levels.

• For arrays, use slice() method to create a new array with the same values.

• Avoid using spread operator for deep copy as it only creates a shallow copy.
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Q13. What is hoisting? Some questions on it
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Q1. Max sum path in tree
Ans. 
Find the maximum sum path in a tree from root to leaf node.
• Start from the root node and traverse down to leaf nodes, keeping track of the sum at each node.

• At each node, compare the sum of the current path with the maximum sum found so far.

• Choose the path with the maximum sum as the final result.
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Q2. Array 2 sum problem
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Q1. React: Create a Timer
Ans. 
Create a simple timer using React
• Use state to store the timer value

• Use setInterval to update the timer every second

• Display the timer value in the component's render method
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Q2. Javascript: implement Debounce
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Q1. What do you know about the company + common behaviour question
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Q2. About roles in previous org
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Round duration - 60 Minutes
Round difficulty - Medium

Mostly focused on Data Structure & Algorithm

Q1. Rotate Linked List
You have been given a Linked List having ‘N’ nodes and an integer ‘K’. You have to rotate the Linked List by ‘K’ positions in a clockwise direction.
Example :
 Given Linked List : 1 2...read more
Ans. Brute Force
Find the length of the Linked List to check whether the ‘K’ is greater than the Length of the Linked List or not. Take a modulo of ‘K’ with its length if it is greater than the length. Reach the (‘K’+1)th node from last and change the pointers of nodes to get a rotated Linked List.
 
Here is the algorithm:
 
1. Base Condition : If ‘HEAD’ is equal to ‘NULL’ or ‘K’ is equal to 0, then return ‘HEAD’ of the L...read more
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Q2. Reverse the order of words in a string
You are given a string ‘STR’ containing space-separated words. A word is a sequence of non-space characters. Your task is to reverse the order of words in ‘STR’.
No...read more
Ans. Convert to an array of words
Use an array ‘ARR’ to store the words in ‘STR’. Traverse the string ‘STR’ and append each word at the end of ‘ARR’. Use the string ‘RES’ to store the answer. Traverse the array ‘ARR’ in reverse and append the words in ‘ARR’ to ‘RES’ followed by a whitespace character.
 
• Create an empty array of string ‘ARR’.
• Initialize an empty string ‘CUR_STR’. Use it to store a single word from ‘STR’.
• Run...read more
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Round duration - 50 Minutes
Round difficulty - Medium

JavaScript core concepts with some examples and problem discussion

Q1. Javascript Questions
1) What is currying in Javascript?
2) Explain hoisting with a code snippet.
3) What does this return (typeof null) ?
4) What is callback hell?
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Round duration - 30 Minutes
Round difficulty - Easy

Q1. Basic HR Questions
Why should we hire you?
What keeps you motivated?
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Q1. Pakage and company placement etc
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Leetcode DSA problems