Q581. What is the difference between Flow and PropTypes?
Flow is a _static analysis tool_ (static checker) which uses a superset of the language, allowing you to add type annotations to all of your code and catch an entire clas...
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Q582. What is the purpose of is, not and in operators?
Operators are special functions. They take one or more values and produce a corresponding result. is: return s true when 2 operands are true (Example: "a" is 'a') not: re...
Q583. 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...
Q584. 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...
Q585. What is CSS preprocessor?
A **CSS preprocessor** is a tooling program that extends standard CSS syntax with programmatic capabilities (such as variables, functions, mixins, and nested rules), comp...
Q586. 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...
Q587. 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 ...
Q588. What is the difference between a CSS preprocessor and a post-processor?
A CSS preprocessor generates CSS code from source code written in a higher-level scripting language, whereas a post-processor takes existing CSS code and applies transfor...
Q589. 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, ```...
Q590. 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`.