Q1051. 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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Q1052. Why would you use something like the load event? Does this event have disadvantages? Do you know any alternatives, and why would you use those?
The `load` event fires at the end of the document loading process. At this point, all of the objects in the document are in the DOM, and all the images, scripts, links an...
Q1053. What's the difference between Native objects and Host objects?
Native objects are objects that are part of the JavaScript language defined by the ECMAScript specification, such as String, Math, RegExp, Object, Function, etc on the ot...
Q1054. 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...
Q1055. 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...
Q1056. What is the data type of variables in JavaScript?
In JavaScript, **variables themselves do not have fixed types; values have types**. JavaScript is a dynamically and weakly typed language, meaning a variable declared wit...
Q1057. 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...
Q1058. 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 ...
Q1059. 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...
Q1060. 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...