Q1211. What is decorator in JavaScript?
In JavaScript, a decorator is a design pattern that allows you to modify the behavior of an object or a function by wrapping it with another function. It provides a way t...
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Q1212. What does the variable environment in JavaScript's function execution context contain, and what is its purpose?
The variable environment contains all the variables, function declarations, and function arguments specific to that function. It keeps track of the function's local varia...
Q1213. What is a scope chain in JavaScript's function execution context?
The scope chain is a list of all the variable environments that are accessible to the function. It is used to resolve variable references during the function's execution....
Q1214. What is an anonymous lambda function in JavaScript?
A lambda function, also known as an arrow function in JavaScript, is a concise and shorthand way of defining a function. It uses the => arrow syntax to indicate a functio...
Q1215. What is variable shadowing in JavaScript?
If there is a variable in the global scope, and you'd like to create a variable with the same name in a function. The variable in the inner scope will temporarily shadow ...
Q1216. 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 ( ... ). ``` ...
Q1217. 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...
Q1218. 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...
Q1219. 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...
Q1220. 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 ...