Q971. What is the purpose of the "use strict" statement in JavaScript?
The "use strict" statement is used to enable strict mode in JavaScript, which helps to prevent common errors and make the code more secure. It prevents things like use of...
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Q972. What is the difference between synchronous and asynchronous code in JavaScript?
Synchronous code executes tasks in sequence and waits for each task to complete before moving on, while asynchronous code can execute multiple tasks simultaneously and do...
Q973. What are promises in JavaScript?
Promises in JavaScript are a way of handling async operations. They help us write async code that looks and behaves like sync code, making it easier to read and maintain....
Q974. What is the difference between async/await and promises in JavaScript?
Both async/await and Promises are used to handle asynchronous operations in JavaScript. However, async/await is built on top of Promises which makes asynchronous code mor...
Q975. How do you handle errors in JavaScript?
In JavaScript, errors can be handled using try-catch blocks. The code that might generate an error is enclosed in a try block, and if an error occurs, the catch block is ...
Q976. What is NaN in JavaScript?
NaN (Not A Number) is a special value in JavaScript that represents a situation where a value is not a valid number. One important thing to note is that NaN is not equal ...
Q977. What is the Document Object Model (DOM)?
The DOM (Document Object Model) is a programming interface that represents the structure and content of an HTML document as a tree-like structure of nodes. It allows deve...
Q978. What is the difference between the DOM and HTML?
HTML is a markup language used to define the structure and content of a web page, while the DOM is an interface that represents that structure and content as a tree-like ...
Q979. What is the difference between the DOMContentLoaded event and the load event?
The DOMContentLoaded event is fired when the initial HTML document has been completely loaded and parsed, while the load event is fired when all resources on the page, in...
Q980. What is the difference between innerHTML and innerText?
The main difference between `innerText` and `innerHTML` in the DOM is that `innerText` returns only the visible text content of an element, excluding any HTML tags, while...