Diksha Advertising & Printing Interview Questions and Answers

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Q1. Tell me difference between Let, Var, Cost and

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Let, var, and const are used to declare variables in JavaScript, with differences in scope and mutability.

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React JS is a JavaScript library for building user interfaces.

React JS is a declarative, efficient, and flexible JavaScript library for building user interfaces.
It allows developers to create reusable UI components.
React uses a virtual DOM for better performance by updating only the necessary parts of the actual DOM.
React follows a unidirectional data flow, making it easier to understand and debug.
React can be used to build single-page applications, mobile apps, and even serv...read more

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Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine that allows developers to run JavaScript code outside of a web browser.

Node.js is used for building server-side applications.
It allows developers to use JavaScript for both client-side and server-side development.
Node.js has a large ecosystem of open-source libraries and frameworks, such as Express.js.
Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient.
Node.js can b...read more

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Closure is the combination of a function bundled together with references to its surrounding state.

Closure allows a function to access variables from its outer scope even after the outer function has finished executing.
It is created whenever a function is defined within another function, and the inner function has access to the outer function's variables.
Closure helps in maintaining the state of a function and allows for data encapsulation.

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let, var, and const are used to declare variables in JavaScript with different scoping rules.

let: block-scoped variable, can be reassigned
var: function-scoped variable, can be reassigned
const: block-scoped variable, cannot be reassigned, but its properties can be modified

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Closure is a function that has access to its own scope, as well as the scope in which it was defined.

A closure allows a function to access variables from an outer function even after the outer function has finished executing.
Closures are commonly used in event handlers, callbacks, and in functional programming.
Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }