BYJU'S Coding Instructor Interview Questions and Answers

var, let, and const are all used to declare variables in JavaScript, but they have different scoping rules and behaviors.

• var has function scope and can be redeclared and reassigned

• let has block scope and can be reassigned but not redeclared

• const has block scope and cannot be reassigned or redeclared

• Use const for values that won't change, let for values that will, and avoid var

CSS box model defines the layout of elements on a webpage. Padding and margin can apply to block-level elements but not to inline elements.

• CSS box model consists of content, padding, border, and margin around an element.

• Padding adds space inside the border of an element.

• Margin adds space outside the border of an element.

• Padding and margin can apply to block-level elements like <div> but not to inline elements lik

Arrow functions are shorter syntax for writing function expressions.

• Arrow functions do not have their own 'this' keyword.

• Arrow functions cannot be used as constructors.

• Arrow functions do not have the 'arguments' object.

• Arrow functions are more concise and easier to read.

• Regular functions are better for methods and constructors.

JavaScript asynchronous model allows non-blocking code execution by using callbacks and promises.

• JavaScript uses an event loop to handle asynchronous operations.

• Callbacks are functions passed as arguments to other functions and executed when the operation is complete.

• Promises are objects that represent the eventual completion or failure of an asynchronous operation.

• Async/await is a newer syntax that allows writing asyn...read more

Use a user table with a column for user type (free, gold, platinum)

• Create a user table with columns for user ID, name, email, user type

• Use a separate table for user types with columns for type ID and type name

• Establish a one-to-many relationship between user and user type tables

• Example: user table - user_id, name, email, type_id; user_type table - type_id, type_name

High-level design for a live rank dashboard for a live test with millions of users.

• Use a scalable architecture to handle millions of users concurrently.

• Implement real-time data processing to update ranks dynamically.

• Utilize caching mechanisms to improve performance and reduce load on the database.

• Design a user-friendly interface with intuitive data visualization.

• Include features for filtering, sorting, and searching to

The device used is a laptop with 16GB RAM, Intel i7 processor, and 512GB SSD.

• Laptop model: Dell XPS 15

• RAM: 16GB

• Processor: Intel i7

• Storage: 512GB SSD

Hobbies are activities or interests pursued for pleasure and relaxation outside of work or study.

• Hobbies are activities that individuals enjoy doing in their free time.

• They can include a wide range of activities such as reading, painting, playing sports, cooking, gardening, etc.

• Hobbies provide a break from daily routine and can help reduce stress.

• They can also be a way to explore new interests and develop new skills.

• So...read more

Education is the process of acquiring knowledge, skills, values, and attitudes through teaching, training, or research.

• Education is a lifelong process that begins from childhood and continues throughout one's life.

• It involves the acquisition of knowledge, skills, values, and attitudes that enable individuals to understand the world around them and participate in society.

• Education can take place in formal settings like ...read more