Q281. What is an app shell model?
An application shell (or app shell) architecture is one way to build a Progressive Web App that reliably and instantly loads on your users' screens, similar to what you s...
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Q282. How to use Font Awesome icons in React?
The below steps followed to include Font Awesome in React: 1. Install `font-awesome`: ```console $ npm install --save font-awesome ``` 2. Import `font-awesome` in your `i...
Q283. Can we define properties for functions?
Yes, we can define properties for functions because functions are also objects. ```javascript fn = function (x) { //Function code goes here }; fn.name = "John"; fn.profil...
Q284. What is React Dev Tools?
_React Developer Tools_ let you inspect the component hierarchy, including component props and state. It exists both as a browser extension (for Chrome and Firefox), and ...
Q285. What is the way to find the number of parameters expected by a function?
You can use `function.length` syntax to find the number of parameters expected by a function. Let's take an example of `sum` function to calculate the sum of numbers, ```...
Q286. Why is DevTools not loading in Chrome for local files?
If you opened a local HTML file in your browser (`file://...`) then you must first open _Chrome Extensions_ and check `Allow access to file URLs`.
Q287. What is a polyfill?
A polyfill is a piece of JS code used to provide modern functionality on older browsers that do not natively support it. For example, Silverlight plugin polyfill can be u...
Q288. How to use Polymer in React?
You need to follow below steps to use Polymer in React, 1. Create a Polymer element: ```jsx harmony ; Polymer({ is: "calendar-element", ready: function () { this.textCont...
Q289. What are break and continue statements?
The break statement is used to "jump out" of a loop. i.e, It breaks the loop and continues executing the code after the loop. ```javascript for (i = 0; i < 10; i++) { if ...
Q290. What are the advantages of React over Vue.js?
React has the following advantages over Vue.js: 1. Gives more flexibility in large apps developing. 2. Easier to test. 3. Suitable for mobile apps creating. 4. More infor...