Q21. How do you detect a mobile browser without regexp?
You can detect mobile browsers by simply running through a list of devices and checking if the useragent matches anything. This is an alternative solution for RegExp usag...
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Q22. How do you make synchronous HTTP request?
Browsers provide an XMLHttpRequest object which can be used to make synchronous HTTP requests from JavaScript. ```javascript function httpGet(theUrl) { var xmlHttpReq = n...
Q23. How do you make asynchronous HTTP request?
Browsers provide an XMLHttpRequest object which can be used to make asynchronous HTTP requests from JavaScript by passing the 3rd parameter as true. ```javascript functio...
Q24. How do you detect a browser language preference?
You can use the navigator object to detect a browser language preference as below, ```javascript var language = (navigator.languages && navigator.languages[0]) || // Chro...
Q25. How do you get the metadata of a module?
You can use the `import.meta` object which is a meta-property exposing context-specific meta data to a JavaScript module. It contains information about the current module...
Q26. What is the difference between java and javascript?
Both are totally unrelated programming languages and no relation between them. Java is statically typed, compiled, runs on its own VM. Whereas JavaScript is dynamically t...
Q27. What is jQuery?
jQuery is a popular cross-browser JavaScript library that provides Document Object Model (DOM) traversal, event handling, animations and AJAX interactions by minimizing t...
Q28. What is V8 JavaScript engine?
V8 is an open source high-performance JavaScript engine used by the Google Chrome browser, written in C++. It is also being used in the node.js project. It implements ECM...
Q29. What is ES6?
ES6 is the sixth edition of the javascript language and it was released in June 2015. It was initially known as ECMAScript 6 (ES6) and later renamed to ECMAScript 2015. A...
Q30. What are the use cases for dynamic imports?
Below are some of the use cases of using dynamic imports over static imports, 1. Import a module on-demand or conditionally. For example, if you want to load a polyfill o...