JavaScript Interview Questions and Answers | Become a Full Stack Web Developer | Uplatz

This JavaScript tutorial by Uplatz provides commonly asked Interview Questions & Answers on JavaScript. This will help you crack Full Stack Web Developer/Programmer interviews. https://training.uplatz.com/online-it-course.php?id=javascript-programming-62

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Here are some common JavaScript interview questions and answers:

What is JavaScript?
Answer: JavaScript is a dynamic and high-level programming language that is mainly used for creating interactive effects on web pages.

What is the difference between null and undefined in JavaScript?
Answer: null is a value that represents the intentional absence of any object value, while undefined is a value that represents an uninitialized or non-existent value.

What is the difference between var, let, and const in JavaScript?
Answer: var is used for declaring variables with global or function scope, while let and const are used for declaring block-scoped variables. The difference between let and const is that let variables can be reassigned, while const variables cannot be reassigned.

What is a closure in JavaScript?
Answer: A closure is a function that has access to variables in its outer function scope, even after the outer function has returned.

What are the different data types in JavaScript?
Answer: JavaScript has several built-in data types, including numbers, strings, booleans, objects, arrays, and null/undefined.

What is the difference between == and === in JavaScript?
Answer: == is a loose equality operator that checks whether two values are equal without considering their data types, while === is a strict equality operator that checks whether two values are equal and have the same data type.

What is the difference between synchronous and asynchronous programming in JavaScript?
Answer: Synchronous programming is a programming model in which tasks are executed in a sequential order, while asynchronous programming is a programming model in which tasks can be executed simultaneously without waiting for the completion of the previous task.

What is hoisting in JavaScript?
Answer: Hoisting is a behavior in JavaScript where variable and function declarations are moved to the top of their respective scopes before code execution.

What is event bubbling in JavaScript?
Answer: Event bubbling is a behavior in JavaScript where an event that is triggered on an inner element is also propagated to its parent and ancestor elements.

What is the purpose of the JavaScript document object?
Answer: The document object is a built-in object in JavaScript that represents the HTML document loaded in the web browser, and provides methods for manipulating the content and structure of the document.

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