Q1121. What are the real world use cases of proxy?
Proxies are not used in regular day to day JavaScript work but they enabled many exciting programming patterns. Some of the real world use cases are listed below, 1. Vue3...
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Q1122. What are hidden classes?
Since JavaScript is a dynamic programming language, you can add or remove properties and methods from objects on the fly at runtime. This nature of JavaScript increases t...
Q1123. What is inline caching?
Inline caching is an optimization technique based on the observation that repeated calls to same function tends to occur on same type of objects. The V8 compiler stores a...
Q1124. What are the different ways to execute external scripts?
There are three different ways to execute external scripts, 1. async: The script is downloaded in parallel to parsing the page, and executed as soon as it is available ev...
Q1125. What is Lexical Scope?
Lexical scope is the ability for a function scope to access variables from the parent scope. ```js function x(){ var a=10; function y(){ console.log(a); // will print a ,...
Q1126. How to detect system dark mode in javascript?
The combination of `Window.matchMedia()` utility method along with media query is used to check if the user has selected a dark color scheme in their operating system set...
Q1127. What is the purpose of requestAnimationFrame method?
The requestAnimationFrame() method in JavaScript is used to schedule a function to be called before the next repaint of the browser window, allowing you to create smooth,...
Q1128. What is the difference between substring and substr methods?
Both `substring` and `substr` are used to extract parts of a string, but there are subtle differences between the substring() and substr() methods in terms of **syntax** ...
Q1129. How to find the number of parameters expected by a function?
The function's object has a **length** property which tells you how many formal parameters expected by a function. This is a static value defined by the function, not the...
Q1130. What is globalThis, and what is the importance of it?
Nowadays JavaScript language is used in a wide variety of environments and each environment has its own object model. Due to this fact, there are different ways(syntax) t...