Qubited Web Developer Interview Questions and Answers

Q1. What is observable and promises
Ans. 
Observables and promises are both used for handling asynchronous operations in JavaScript.
• Observables are used for handling multiple values over time, while promises are used for handling a single value at a time.

• Observables can be cancelled, while promises cannot be cancelled.

• Promises have a built-in mechanism for error handling using the catch method, while observables use the error callback function.

• Observables are ...read more
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Write a code for unique array

Q1. Create a Todo app
Ans. 
A simple Todo app to manage tasks and deadlines
• Create a form to add new tasks

• Display a list of tasks with checkboxes to mark as complete

• Include options to edit or delete tasks

• Implement functionality to mark tasks as complete or incomplete

• Add a feature to filter tasks by status (completed/incomplete)
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Q2. Lifecycle methods
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Round duration - 60 minutes
Round difficulty - Medium

Online Coding Test on Calyxpod platform. There were 2 coding questions

Q1. Intersection of Linked List
You are given two Singly Linked List of integers, which are merging at some node of a third linked list.
Your task is to find the data of the node at which merging starts. If ...read more
Ans. Brute Force
• For each node in the first list, traverse the entire second list
• Check if any node in the second list coincides with the first list
  • If it does, return that node’s data
  • If it doesn’t, return -1
Space Complexity: O(1)Explanation:
O(1)
 
Since we only use constant space.
Time Complexity: O(m*n) - For 2d arraysExplanation:
O(N * M), where N and M are the lengths of the first and second linked lists respectively.&n...read more
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Q2. Most Frequent Word
You are given a paragraph that may have letters both in lowercase and uppercase, spaces, and punctuation. You have also given a list of banned words. Now your task is to find the most fr...read more
Ans. Brute Force
1. To find the frequency of each word we need to extract the words from the paragraph.
2. So we will convert all the punctuation to space in the paragraph and lowercase alphabets to uppercase.
3. Now we can use the library function (e.g sstream in C++) to extract words from the paragraph in an array of strings say WORDS.
4. We will iterate over WORDS and do:
   1. Iterate over the banned array and check if the current word is pre...read more
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Round duration - 70 minutes
Round difficulty - Easy

Advance Subjective Round on Calyxpod platform: 5 questions. One question was related to data structures and algorithms. Other 4 were related to Html, CSS and Javascript.

Q1. Balanced parentheses
Given an integer ‘N’ representing the number of pairs of parentheses, Find all the possible combinations of balanced parentheses with the given number of pairs of parentheses.
Note :
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Ans. Recursion
The idea is to generate all possible combinations and check whether the combination is the combination of balanced parentheses or not. We have two choices whether to consider ‘(‘ or ‘)’.
When the number of closing brackets is greater than the number of opening brackets we can consider taking ‘)’ in the sequence and in the other case we can consider taking ‘(‘ for all numbers of opening brackets until the number...read more
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Medium level questions asked

Simple easy to medium 2 questions asked of string and array

Q1. Tell me about yourself
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Q2. JavaScript like fetch axios and others
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I was asked 60 question with various snppits or problems to be solved within a time frame of 1 hour

3 dsa 2 medium 1 hard

To create a project in which i was asked to simply create a exact same page as given in design