Porter Front end Developer Interview Questions and Answers

Question are very tough and faad

Question like trees linked list and graphs

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
Answered by CodingNinjas
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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
Answered by CodingNinjas
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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?
Add your answer

Round duration - 30 Minutes
Round difficulty - Easy

Q1. Basic HR Questions
Why should we hire you?
What keeps you motivated?
Add your answer

Q1. Polyfill for bind Closures Call apply bind let const var lexical environment scope output questions
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Coding test in javascript

Q1. React js questions
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Q2. Angular js questions
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Question are very tough and faad

Question like trees linked list and graphs

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
Answered by CodingNinjas
View 1 more answer
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
Answered by CodingNinjas
View 1 more answer

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?
Add your answer

Round duration - 30 Minutes
Round difficulty - Easy

Q1. Basic HR Questions
Why should we hire you?
What keeps you motivated?
Add your answer

Q1. Create a pagination
Ans. 
Pagination component to display a list of items with page navigation.
• Create a Pagination component with props for total number of items, items per page, and current page.

• Calculate total number of pages based on total items and items per page.

• Display page numbers with previous and next buttons to navigate through pages.

• Update the list of items displayed based on current page.

• Handle click events on page numbers and previ
Answered by AI
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Q1. Write a polyfill of JS promise
Ans. 
A polyfill for JS promise is a piece of code that provides support for promises in older browsers.
• Create a Promise class with resolve, reject, then, and catch methods

• Implement the executor function to handle the asynchronous operation

• Use setTimeout to simulate asynchronous behavior

• Handle chaining of then and catch methods
Answered by AI
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Q1. How to detect and prevent Memory leak
Ans. 
Memory leaks can be detected and prevented by monitoring memory usage, using memory profiling tools, avoiding circular references, and properly managing event listeners.
• Monitor memory usage regularly to identify any abnormal increases.

• Use memory profiling tools like Chrome DevTools or Valgrind to analyze memory usage.

• Avoid creating circular references in your code, as they can prevent objects from being garbage collect...read more
Answered by AI
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Q1. Advanced JS questions
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