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This is among the most asked react as interview question. render() in react js creates a blueprint of every object and updates every jsx element which is pretty faster as we are not dealing with dom directly. Then, changes are compared with the dom and updation process takes place on the dom with only changed nodes than checking the changes in dom and updating every single node that used to happen otherwise.
Redux is also a js library used with react to write applications on either client side, server end to test the application better, and works in a unidirectional way like react.
React js is a library whereas next js is react js framework used to build server-side rendered application providing control over babel and webpack.
In client-side rendering, HTML gets loaded first, and then the content is drawn using js and API hits from the server whereas in server-side rendering, the components are loaded at server-side and the output is HTML code.
React apps call once ReactDom.render() where the root element is loaded into the dom And doesn’t modifies the container node but only the children nodes. Below index.js calls app.js which has our landing page component attached to it.
Flux is an architecture that Facebook follows while developing react application for the unidirectional flow of data that react js uses via using dispatcher library along with NodeJs EventEmitter.
Jest is a module that is used to test react js applications.
yarn add –dev react-test-renderer
Unlike Angular which supports two-way data binding, in react js the state is passed onto the view where changes are reflected. There is one single source truth to it. What it means is that the container holding the value of object can only be changed/added/rendered from the component and its value would be reflected everywhere, unlike in Angular that you could change the value of object from both view and controller.
Shadow dom are the implementation of elements you hide. Root is detached from children which can be accessed publically, but not the root.
var div = document.createElement('div');
var shadowRoot = div.attachShadow({mode: 'open'});
shadowRoot.innerHTML = '<h1>Hello Shadow DOM</h1>';
<my-header>
<header>
<h1>
<button>
<my-header>
#shadow-root
<header>
<h1>
<button>
The reason to choose react js is that its faster, but now angular applications with new features have outdrawn that also. Angular has two-way data binding, which react doesn’t and just transition for ajax developer to js requires a lot of effort
Note: Carefully answer as this is a trick question among other react js interview questions
React js is better when the application size is smaller and for new developers learning curve of react js is way smaller than angular as angular is a full-fledged framework with MVC structure. Also with react js transition to react native is possible.
They both are separated because the fact react has extended application for mobile via react-native language so react library is for both mobile and web applications whereas react-dom is limited to web applications only.
This is a tricky among the all react js interview questions. React Native would open the pathways for mobile application development whereas with angular one can master front-end web development. At the end of the day a developer must be comfortable to grasp faster and implement the skills on the project to come.
So, these were among the most asked react js interview questions. Do checkout similar Posts.
Both. Its just about react js.
Its better to take few months and develop an app first.
Well atleast you can become a part of the present atleast.
Angular as its a framework, not a library and pretty easy to scale.
Just what I needed