Atul Automotives Interview Questions and Answers

querySelector selects elements using CSS selectors, while getElementWithClass selects elements by class name.

• querySelector uses CSS selectors to select elements, while getElementWithClass selects elements by class name

• querySelector can select elements based on any CSS selector, while getElementWithClass is limited to selecting elements by class name

• querySelector returns the first matching element, while getElementWithClass returns a collection of elements with the specified c...read more

Object-oriented programming concepts include encapsulation, inheritance, polymorphism, and abstraction.

• Encapsulation: bundling data and methods that operate on the data into a single unit (class). Example: class Car with properties like color and methods like start() and stop().

• Inheritance: allows a class to inherit properties and methods from another class. Example: class SUV inheriting from class Car.

• Polymorphism: ability of a method to do different things based on the obje...read more

Backend structure refers to the organization of server-side components that handle data processing and storage.

• Backend structure typically includes databases, servers, APIs, and application logic.

• Databases store and manage data, servers handle requests and responses, APIs facilitate communication between different components, and application logic processes data and implements business rules.

• For example, a backend structure for an e-commerce website may include a MySQL databa...read more

let is block scoped while var is function scoped in JavaScript.

• let variables are limited to the block in which they are declared, while var variables are limited to the function in which they are declared.

• Using let can help prevent variable hoisting issues that may occur with var.

• let allows for better code readability and maintainability compared to var.

Closures in JavaScript allow functions to access variables from their outer scope even after the outer function has finished executing.

• Closures are created whenever a function is defined within another function.

• Inner functions have access to the outer function's variables even after the outer function has returned.

• Closures can be used to create private variables and functions in JavaScript.