Q531. What is a rest operator in JavaScript?
The rest operator in JavaScript is a special syntax that allows you to pass an indefinite number of arguments to a function. It is represented by three dots ( ... ). ``` ...
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Q532. What's a typical use case for anonymous functions?
Anonymous functions are functions that are not bound to a name. They are often used as inline functions, or as arguments to other functions. One typical use case for anon...
Q533. What is negative Infinity?
In JavaScript, **`-Infinity`** is a numeric value representing negative infinity within the IEEE 754 floating-point standard. It is lower than any other representable num...
Q534. What is the difference between a prototype and an instance?
A prototype is a blueprint for creating objects. An instance is an object that is created from a prototype. Instances inherit properties and methods from their prototypes...
Q535. What is a function expression?
A function expression in JavaScript is a way to define a function by assigning it to a variable. Instead of using the traditional function declaration syntax, a function ...
Q536. What is the difference between a module and a library?
A module is a self-contained unit of code that can be imported into another program. A library is a collection of modules that can be used to perform a specific task. Mod...
Q537. How are JavaScript and ECMA Script related?
**ECMAScript (ES)** is the official open standard and specification (managed by Ecma International and the TC39 committee), while **JavaScript (JS)** is the commercial pr...
Q538. What are the different types of errors in JavaScript?
There are three types of errors: 1. Load time errors: Errors that come up when loading a web page, like improper syntax errors, are known as Load time errors and generate...
Q539. What is the use of the blur function?
In JavaScript, the `blur()` function is used to remove the focus from a specific element on a web page. When an element has focus, it typically means that it is selected ...
Q540. What is the difference between an alert box and a confirmation box?
An alert box is a simple message box with an OK button for displaying information, while a confirmation box allows users to confirm or cancel an action with OK and Cancel...