Q501. 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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Q502. 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 ...
Q503. 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 ...
Q504. 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 ...
Q505. 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...
Q506. What is a DOM node in JavaScript?
A node in the DOM is a fundamental unit that represents an element, attribute, or text content in a web page. Every node has a relationship with other nodes, such as a pa...
Q507. What is call stack in JavaScript?
The call stack in JavaScript is a data structure that stores information about the currently executing functions. When a function is called, a new frame is added to the t...
Q508. What is the use of `setTimeOut()` in JavaScript?
`setTimeout()` is a built-in function in JavaScript that allows you to schedule a function to be executed after a specified amount of time has elapsed.
Q509. What is the use of `setInterval()` in JavaScript?
`setInterval()` is a function in JavaScript that allows you to repeatedly execute a given function at a specified interval. It works by calling the function repeatedly wi...
Q510. What is a JSON?
JavaScript Object Notation (JSON) is a standard text-based format for representing structured data based on JavaScript object syntax. It is commonly used for transmitting...