10+ Zoho Member Technical Staff Interview Questions and Answers

A class in JavaScript is a blueprint for creating objects with similar properties and methods.

• Classes are used to create multiple objects with the same structure and behavior.

• They provide a way to organize and encapsulate related data and functions.

• Classes can have properties (variables) and methods (functions) that define their behavior.

• Instances of a class can be created using the 'new' keyword.

• Classes can also have constructors, which are special methods called when an obj...read more

Use triggers to update related table on row modification.

• Create a trigger on the main table to update the related table

• Use the UPDATE statement in the trigger to modify the related table

• Ensure that the trigger is efficient and does not cause performance issues

• Test the trigger thoroughly to ensure that it works as expected

The sequence of steps a browser takes to convert HTML, CSS, and JavaScript into a rendered page.

• Includes parsing HTML, constructing the DOM tree, calculating styles, and executing JavaScript.

• Optimizing the critical rendering path can improve page load times and user experience.

• Examples of optimization techniques include minimizing render-blocking resources and using lazy loading.

• The critical rendering path can vary depending on the browser and device being used.

An instance is a specific object created from a class, while a class is a blueprint or template for creating objects.

• An instance is created from a class using the 'new' keyword.

• Classes define the properties and behaviors of objects, while instances represent specific objects with their own unique data.

• Multiple instances can be created from the same class.

• Classes can be thought of as a cookie cutter, while instances are the cookies cut out from the dough.

• Example: Class 'Car' d...read more

Asynchronous in JS means executing code without blocking the main thread.

• Asynchronous code allows other code to run while waiting for a task to complete.

• It is commonly used for network requests, file I/O, and other time-consuming operations.

• Callbacks, Promises, and Async/Await are common ways to handle asynchronous code in JS.

Use stack data structure to efficiently check validity of brackets in a string.

• Create an empty stack

• Traverse the string character by character

• If the character is an opening bracket, push it onto the stack

• If the character is a closing bracket, check if it matches the top of the stack

• If it matches, pop the top element from the stack

• If it doesn't match or the stack is empty, return false

• After traversing the entire string, if the stack is empty, return true

• Otherwise, return false

Mobile first design is an approach where the design and development of a website or application starts with the mobile version.

• Designing for smaller screens first

• Prioritizing content and functionality for mobile users

• Adapting the design for larger screens

• Focusing on speed and performance

• Examples: Instagram, Twitter, and Facebook

Use binary search to find the second largest element in O(log n) time complexity.

• Sort the array in descending order.

• Return the second element in the sorted array.

• Example: Input [5, 2, 8, 10, 3], Output: 8

Rotate an array with given number of times.

• Use a temporary array to store elements to be rotated

• Loop through the original array and copy elements to the temporary array

• Copy the rotated elements from the temporary array back to the original array

A fintech app class diagram and system design involves modeling classes, relationships, and interactions for financial services.

• Identify key classes such as User, Account, Transaction, and Payment

• Define relationships between classes (e.g. User has many Accounts, Account has many Transactions)

• Consider security measures for sensitive financial data

• Include features like authentication, authorization, and encryption

• Design a scalable and efficient system architecture to handle hig...read more

Building a Swiggy-like application using Tomcat

• Utilize Tomcat as the web server to handle HTTP requests

• Implement a database to store user information, restaurant details, and orders

• Develop a user-friendly interface for customers to browse restaurants and place orders

• Integrate payment gateway for secure transactions

• Implement features like order tracking, reviews, and ratings for restaurants

• Ensure scalability and performance by optimizing code and server configurations

A class in a real time scenario is like a blueprint for creating objects with similar properties and behaviors.

• Classes are used to define the structure and behavior of objects in object-oriented programming.

• They encapsulate data and methods that operate on that data.

• For example, in a banking system, a 'Customer' class can have properties like name, account number, and methods like deposit, withdraw.

• Classes help in organizing code, promoting reusability, and maintaining code c...read more

Coding in machine with complex problems requires strong problem-solving skills and knowledge of algorithms.

• Understand the problem thoroughly before starting to code

• Break down the problem into smaller subproblems

• Use appropriate data structures and algorithms to solve the problem efficiently

• Test your code thoroughly to ensure it works correctly

• Optimize your code for performance if necessary

Merge sort is a divide and conquer algorithm that divides the input array into two halves, sorts each half, and then merges them back together.

• Divide the input array into two halves

• Recursively sort each half

• Merge the sorted halves back together

Database modeling for an accounting application

• Identify entities such as customers, invoices, transactions, and accounts

• Establish relationships between entities (e.g. one-to-many, many-to-many)

• Consider normalization to reduce redundancy and improve data integrity

• Use primary keys and foreign keys to maintain data consistency

• Implement constraints to enforce business rules (e.g. unique constraints, check constraints)