Q181. How do you find operating system details?
The window.navigator object contains information about the visitor's browser OS details. Some of the OS properties are available under platform property, ```javascript co...
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Q182. How to use `<FormattedMessage>` as placeholder using React Intl?
The `` components from `react-intl` return elements, not plain text, so they can't be used for placeholders, alt text, etc. In that case, you should use lower level API `...
Q183. What is the difference between document load and DOMContentLoaded events?
The `DOMContentLoaded` event is fired when the initial HTML document has been completely loaded and parsed, without waiting for assets(stylesheets, images, and subframes)...
Q184. How to access current locale with React Intl?
You can get the current locale in any component of your application using `injectIntl()`: ```jsx harmony import { injectIntl, intlShape } from "react-intl"; const MyCompo...
Q185. What is the difference between native, host and user objects?
`Native objects` are objects that are part of the JavaScript language defined by the ECMAScript specification. For example, String, Math, RegExp, Object, Function etc cor...
Q186. How to format date using React Intl?
The `injectIntl()` higher-order component will give you access to the `formatDate()` method via the props in your component. The method is used internally by instances of...
Q187. What are the tools or techniques used for debugging JavaScript code?
You can use below tools or techniques for debugging javascript 1. Chrome Devtools 2. debugger statement 3. Good old console.log statement
Q188. What is Shallow Renderer in React testing?
_Shallow rendering_ is useful for writing unit test cases in React. It lets you render a component _one level deep_ and assert facts about what its render method returns,...
Q189. What are the pros and cons of promises over callbacks?
Below are the list of pros and cons of promises over callbacks, **Pros:** 1. It avoids callback hell which is unreadable 2. Easy to write sequential asynchronous code wit...
Q190. What is `TestRenderer` package in React?
This package provides a renderer that can be used to render components to pure JavaScript objects, without depending on the DOM or a native mobile environment. This packa...