React Native Practice Test
What is the meaning of Babel?
Explanation:
Babel is a JavaScript compiler capable of converting markup and programming languages into JavaScript.
You can use the latest JavaScript features using Babel (ES6 - ECMAScript 2015). Babel can be used for a
variety of conversions. Babel is used by React to transform JSX to JavaScript.
What is the implementation of the Navigator component in React Native?
Explanation:
JavaScript, sometimes known as JS, is a computer language that follows the ECMAScript standard.
JavaScript is a high-level programming language that is frequently compiled just-in-time and is
multi-paradigm. It has first-class functions, dynamic typing, and prototype-based object orientation.
Who was the author of the JSL when it was first written?
Explanation:
Jordan Walke is the creator of React. a Facebook software developer who "FaxJS," a React early prototype, was
released. He was persuaded by XHP is a PHP HTML component library. It was originally used on Facebook's platform.
In 2011, News Feed was launched, followed by Instagram in 2012. It was open-sourced at the time.In May 2013, there
was a JSConf in the United States.
What is the method for passing data to a component from the outside in React?
Explanation:
Props are used to send data from the outside to a component.
Which HTML keywords aren't available in JSX?
Explanation:
The correct answer
Both Class and For
When was the first release of the JavaScript library?
Explanation:
React was initially utilized in Facebook's newsfeed in 2011. In 2013, it was made available as an open source project.
It's yet another JavaScript library for creating user interfaces.
How can you get to a component's state from within a member function?
Explanation:
The correct answer
this.va|ues
Choose the result of typing "npm init" at the command prompt.
Explanation:
This command is used to generate the package.json file for a project. A package.json file will be generated
and placed in the current directory when you complete the npm init steps.
What can you build with React?
Explanation:
Developers may use React to build massive web applications that can alter data without reloading the page.
React's major goal is to be quick, scalable, and easy to use. It only works on the application's user interfaces.
This relates to the MVC template's view.
Other components are — into props.
Explanation:
The correct answer
Methods
Flexibility in React Native is
Explanation:
Flex is a numerical value in React Native. You may have seen it as a string in CSS for the web. This is easier for
me to comprehend than using a string. If flex is a positive number, the component is flexible and its value is
proportional to its size.
When Walke designed React, where was he working?
Explanation:
Jordan Walke, the developer of ReactJS, just revealed on Twitter that he is leaving Facebook after a decade
of service. Walke was a software engineer at the social media giant, where he worked on the React JavaScript
library.
In react, keys are assigned to a list of elements. These are the keys:
Explanation:
The correct answer
Unique among the siblings only
The rendering of a JSX file requires
Explanation:
The react-dom package contains DOM-specific functions that can be used at the top level of your app
as well as as an escape hatch if you need to leave the React model.
Which of the following is the correct flux concept data flow sequence?
Explanation:
Data flows in a single direction in the Flux application (unidirectional). The flux pattern revolves around
this data flow. The dispatcher, stores, and views are all self-contained nodes with their own inputs and
outputs. The actions are straightforward objects with new data and a type property.
Which file indicates that React has been installed?
Explanation:
The package.json file lists all of the dependencies for the project we're working on. It's also used to define
the project's version of the package, which makes it a lot easier for developers to share their work with
their coworkers and other developers.
To update the state of a react component, what function is used?
Explanation:
The correct answer
this.setState
Choose the component that React uses to arrange HTML elements.
Explanation:
In declarative web frameworks like React, Vue.js, and Elm, a virtual DOM is a lightweight JavaScript
representation of the DOM. Updates to the virtual DOM are far faster than updates to the actual DOM.
What does React Native's View component support in terms of layout?
Explanation:
The correct answer
All of the above
What types of images does React Native's Image component support?
Explanation:
The correct answer
All of the above