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Your answers will help employers determine if you're a good match with the company's mission and style of work. 1. Give me an example of how you set goals. 2. Viva Education is Top School Book Publishers in India. We also Provide Best Academic School Books, Textbook, Practice Workbook, NCERT Books for CBSE. The Array class in Kotlin is used to represent arrays. It has the get and set functions that, due to operator overloading conventions, can be. COVER ART 4.0 TORRENT FOR MEDIA BROWSER Design decision was software VMS FortiCentral it wil only Co-Host the Co-Host drag it to thing as the Another application we up so much. Finding a solution and then finally turning their idea. To view the tech news, in.

Answer : The process of monitoring as well as maintaining things of value to an entity or group is called an Asset Management. Configuration Management refers to the process of controlling, identifying, planning for, and verifying the configuration items within service in support of Change Management. Answer : Core operations of DevOps in terms of development and infrastructure are:. Answer: DevOps is the value-added practice wherein the development, as well as operation engineers, work together from the initial point of designing a product to deployment in the markets.

Answer: DevOps is a cultural shift wherein a collaboration and operation teams work together throughout the product or service life cycle. Answer: The priorities in DevOps include resource management, teamwork, and communication. Answer: The varied benefits of DevOps include innovation, stability, functionality, and speed. Answer: Git pull is common that pulls any new commits from a branch of the central repository to update the target branch.

Git fetch pulls any new commits from only the desired branch and then stores them into a new brand of the local repository. Answer: Forking Workflow gives every developer with their service side repositories, thereby supporting open source projects.

Answer: Forking Workflow is better than Git Workflow because it helps in integrating the contributions of different developers without needing everyone to push to a single central repository for cleaning project history. Thus the developers are allowed to push their server-side repositories, and thereby on the project maintainer will push to the official repository.

Answer: Git rebase is a command which is designed to integrate the changes from one branch to another brand. Answer: Git rebase is different from Git merge because, in the case of Git rebase, the feature branch is transferred to the master branch's ending point.

However, in the case of Git merge, the merging adds to a new commit in the history wherein history does not change, but the master branch is changed. Answer: Yes, we can move or copy the Jenkins from one server to other. For instance, by copying the Jenkins jobs directory can be moved from the older server to the new server. This way, installation can be moved from one installation to another by copying in the corresponding job directory.

Answer: Yes, we can make a new copy of an existing Jenkins job by creating a clone of the directory in a different name. Answer: In continuous testing, the process of executing the automated test is part of the software delivery process. In contrast, automation testing is a process wherein the manual process of testing is applied wherein the separate testing tool helps the developers in creating test scripts that can be executed again and again without any kind of manual intervention.

Answer: The role of a Selenium Grid is to execute the same or different test scripts and that too on different platforms and browsers so that the distributed test execution can be made. It helps in testing under various environments and offers an ability to save execution time. Answer: Jenkins pipeline is a suite of plugins that supports the implementation and integration of Jenkins's continuous delivery pipeline.

Answer: Continuous integration, also known as a continuous delivery pipeline, includes functions of build, deploy, test, and release. It is a time-saving feature and builds jobs that are integrated and chain into a particular sequence. Answer: Puppet Module is a collection of manifest and data, including files, templates, and facts that have a specific directory structure. Answer: Puppet Manifests use the. They are Puppet programs, which consist of the Puppet Code. On the other hand, Puppet Modules organizes various kinds of Puppet Manifests that can split the Puppet code with it.

Answer: Yes, we can install Ansible on the controlling machine by using the machine nodes that are managed with the help of SSH. Answer: Yes, Ansible is an agentless tool because it does not require any kind of mandatory installations on the remote nodes. The benefits of the Ansible tool include the following:. That completes the list of the Top DevOps interview questions and answers.

In addition to increasing your chances of securing a DevOps job, these will definitely help you assess as well as enhance your current level of DevOps understanding. Looking for more DevOps interview preparation content? DevOps interview will not have questions only about DevOps; the interviewer will certainly ask you some generic software development questions as well. Cracking the Coding Interview: Programming Questions and Solutions can help you prepare for generic programming interview question s.

My name is Vijay Singh Khatri, and I enjoy meeting new people and finding ways to help them have an uplifting experience. I have had a variety of customer service opportunities, through which I was able to have fewer returned products and increased repeat customers, when compared with co-workers. Currently working with hackr. It's wrong enough to say that Ansible scales better.

SSH is slow and Ansible cannot scale and this is the most common answer that you'll find everywhere. Please explain to me how would you run Ansible on thousand nodes. You split the nodes into batches, and push the run from several places? And, since the code is decentralized, you'll need to pull your repository from thousand nodes, which is not possible.

On my Gitlab I can make around 50 parallel pulls before the performance starts degrading. Salt-stack is faster than Ansible, because ZMQ is faster than ssh. With Puppet you can have more than one master, using an SRV record, and they will in load-balancing. I enjoyed reading through the questions and answers. It's helping me to prepare for an interview. Thanks for sharing these questions and answers. Don't have an account? Sign Up. Already have an account? We recognized you are using an ad blocker.

We totally get it. Still, ads support Hackr and our community. That's why we give you the option to donate to us, and we will switch ads off for you. Submit a tutorial Jobs Sign In. Interview Questions and DevOps. DevOps Tutorials. Related Tutorials Alexa Skills Kit. CompTIA Certification. Data Science. Intro to Programming. DevOps Tutorial for Beginners youtube. View More.

Vijay Singh. Table of Contents. Question: Why has DevOps gained popularity over the past few years? Question: What is the difference between Ansible and Puppet? Question: What are the different components of Selenium? Question: What is the purpose of configuration management in DevOps?

Question: What is the difference between a centralized and distributed version control system VCS? Question: Explain the differences between git pull and Git fetch? Question: What is git stash? Question: What is a merge conflict in Git, and how can it be resolved? Question: Why do we need DevOps? Question: What are the important business and technical benefits of using DevOps?

Question: Can you name some of the most-used DevOps tools? Question: What is Selenium used for? Question: What do you understand by Puppet in DevOps? Question: What do you understand by anti-patterns of DevOps? Question: DevOps has something called CI. What is it and what is its purpose? Question: More often than not we hear shift left in DevOps. What is it? Question: In your opinion, what are the major benefits of implementing DevOps automation?

Question: What do you understand by containers? Question: Microservices are a core part of DevOps. Can you name any two popular Java development frameworks for creating microservices? Define its uses. Question: Git is a popular DevOps tool. Tell us how you will revert a commit that has already been pushed and made public. Question: What are post mortem meetings? Question: Can you state and explain various key elements of continuous testing?

Question: Please explain the core operations of DevOps in terms of development and infrastructure. Question: What is DevOps? Question: What is the basic premise of DevOps? Question: Which methodology is DevOps related to? Question: What are the priorities in DevOps? Question: What are the benefits of DevOps? Question: What are the different advantages of Git?

Question: What is the difference between Git fetch and Git pull? Question: Can we handle merge conflict in Git? Question: What is Forking Workflow? Question: What is Git rebase? Question: How is Git rebase different from Git merge? Question: Can we move or copy Jenkins from one server to another? Question: Can we make a new copy of an existing Jenkins job? Question: What is the difference between continuous testing and automation testing? Question: What is the role of a Selenium Grid?

Question:Can we secure Jenkins? Question:What is Jenkins Pipeline? Question:What is continuous integration? Question: What is a Puppet Module? Question: What is Ansible work in DevOps? Question: What are the categories of Ansible in DevOps? Question: Can we install Ansible on the controlling machines? Question: Are Ansible agentless tool? What are its benefits?

Vijay Singh My name is Vijay Singh Khatri, and I enjoy meeting new people and finding ways to help them have an uplifting experience. Leave a comment. Submit Cancel. Max Adamo. DevOps Tutorial for Beginners www. Welcome Back. Forgot Password. Welcome to Hackr. The preferred approach is to call setState with function rather than object. That function will receive the previous state as the first argument, and the props at the time the update is applied as the second argument.

StrictMode is a useful component for highlighting potential problems in an application. It activates additional checks and warnings for its descendants. These checks apply for development mode only. Mixins are a way to totally separate components to have a common functionality. Mixins should not be used and can be replaced with higher-order components or decorators.

One of the most commonly used mixins is PureRenderMixin. You might be using it in some components to prevent unnecessary re-renders when the props and state are shallowly equal to the previous props and state:. The primary use case for isMounted is to avoid calling setState after a component has been unmounted, because it will emit a warning. Checking isMounted before calling setState does eliminate the warning, but it also defeats the purpose of the warning. Using isMounted is a code smell because the only reason you would check is because you think you might be holding a reference after the component has unmounted.

An optimal solution would be to find places where setState might be called after a component has unmounted, and fix them. Such situations most commonly occur due to callbacks, when a component is waiting for some data and gets unmounted before the data arrives. Ideally, any callbacks should be canceled in componentWillUnmount , prior to unmounting. Pointer Events provide a unified way of handling all input events. In the old days we had a mouse and respective event listeners to handle them but nowadays we have many devices which don't correlate to having a mouse, like phones with touch surface or pens.

We need to remember that these events will only work in browsers that support the Pointer Events specification. If you are rendering your component using JSX, the name of that component has to begin with a capital letter otherwise React will throw an error as an unrecognized tag. You can define component class which name starts with lowercase letter, but when it's imported it should have capital letter.

Here lowercase is fine:. The component names should start with an uppercase letter but there are few exceptions to this convention. The lowercase tag names with a dot property accessors are still considered as valid component names. For example, the below tag can be compiled to a valid component,. In the past, React used to ignore unknown DOM attributes.

This is useful for supplying browser-specific non-standard attributes, trying new DOM APIs, and integrating with opinionated third-party libraries. You should initialize state in the constructor when using ES6 classes, and getInitialState method when using React. Note: React.

Use plain JavaScript classes instead. By default, when your component's state or props change, your component will re-render. If your render method depends on some other data, you can tell React that the component needs re-rendering by calling forceUpdate. It is recommended to avoid all uses of forceUpdate and only read from this. When you want to access this.

Outside constructor both will display same value for this. You can simply use Array. For example, the items array of objects is mapped into an array of components:. This is because JSX tags are transpiled into function calls , and you can't use statements inside expressions. This may change thanks to do expressions which are stage 1 proposal. React or JSX doesn't support variable interpolation inside an attribute value. The below representation won't work:. But you can put any JS expression inside curly braces as the entire attribute value.

So the below expression works:. If you want to pass an array of objects to a component with a particular shape then use React. You shouldn't use curly braces inside quotes because it is going to be evaluated as a string. Instead you need to move curly braces outside don't forget to include spaces between class names :.

The react package contains React. Component , React. Children , and other helpers related to elements and component classes. You can think of these as the isomorphic or universal helpers that you need to build components. The react-dom package contains ReactDOM. React v0. By looking at some of the packages, react-native , react-art , react-canvas , and react-three , it has become clear that the beauty and essence of React has nothing to do with browsers or the DOM.

To build more environments that React can render to, React team planned to split the main React package into two: react and react-dom. This paves the way to writing components that can be shared between the web version of React and React Native. Since for is a reserved keyword in JavaScript, use htmlFor instead. You can listen to the resize event in componentDidMount and then update the dimensions width and height. You should remove the listener in componentWillUnmount method.

When you use setState the current and previous states are merged. Usually setState is used unless you really need to remove all previous keys for some reason. The componentDidUpdate lifecycle method will be called when state changes. You can compare provided state and props values with current state and props to determine if something meaningful changed.

It has been deprecated in latest releases. The React philosophy is that props should be immutable and top-down. This means that a parent can send any prop values to a child, but the child can't modify received props. You can do it by creating ref for input element and using it in componentDidMount :. Create a file called something like polyfills.

Run npm install core-js or yarn add core-js and import your specific required features. Use the polyfill. In the above script we had to explicitly request the Array. You can edit your package. After that restart the development server. You need to use setInterval to trigger the change, but you also need to clear the timer when the component unmounts to prevent errors and memory leaks.

React does not apply vendor prefixes automatically. You need to add vendor prefixes manually. With the export specifier, the MyProfile is going to be the member and exported to this module and the same can be imported without mentioning the name in other components. React's reconciliation algorithm assumes that without any information to the contrary, if a custom component appears in the same place on subsequent renders, it's the same component as before, so reuses the previous instance rather than creating a new one.

You could use the ref prop to acquire a reference to the underlying HTMLInputElement object through a callback, store the reference as a class property, then use that reference to later trigger a click from your event handlers using the HTMLElement. React Native ships with Babel and a set of transforms.

One common way to structure projects is locate CSS, JS, and tests together, grouped by feature or route. It is recommended to avoid hard coding style values in components. Any values that are likely to be used across different UI components should be extracted into their own modules.

ESLint is a popular JavaScript linter. There are plugins available that analyse specific code styles. One of the most common for React is an npm package called eslint-plugin-react. By default, it will check a number of best practices, with rules checking things from keys in iterators to a complete set of prop types. Another popular plugin is eslint-plugin-jsx-a11y , which will help fix common issues with accessibility. As JSX offers slightly different syntax to regular HTML, issues with alt text and tabindex , for example, will not be picked up by regular plugins.

You should fetch data in the componentDidMount lifecycle method. This is so you can use setState to update your component when the data is retrieved. Render Props is a simple technique for sharing code between components using a prop whose value is a function.

The below component uses render prop which returns a React element. React Router is a powerful routing library built on top of React that helps you add new screens and flows to your application incredibly quickly, all while keeping the URL in sync with what's being displayed on the page.

React Router is a wrapper around the history library which handles interaction with the browser's window. It also provides memory history which is useful for environments that don't have global history, such as mobile app development React Native and unit testing with Node. The above components will create browser , hash , and memory history instances. React Router v4 makes the properties and methods of the history instance associated with your router available through the context in the router object.

If you think of the history as an array of visited locations, push will add a new location to the array and replace will replace the current location in the array with the new one. The withRouter higher-order function will inject the history object as a prop of the component. This object provides push and replace methods to avoid the usage of context.

The ability to parse query strings was taken out of React Router v4 because there have been user requests over the years to support different implementation. So the decision has been given to users to choose the implementation they like. The recommended approach is to use query strings library.

The search property is used to pass query params in push method. So you just need to simply drop path attribute as below. Create a module that exports a history object and import this module across the project. Import the above history. You can also use push method of history object similar to built-in history object:.

Like server-side redirects, the new location will override the current location in the history stack. The React Intl library makes internalization in React straightforward, with off-the-shelf components and an API that can handle everything from formatting strings, dates, and numbers, to pluralization.

In that case, you should use lower level API formatMessage. You can inject the intl object into your component using injectIntl higher-order component and then format the message using formatMessage available on that object. You can get the current locale in any component of your application using injectIntl :. 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 FormattedDate and it returns the string representation of the formatted date. 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, without worrying about the behavior of child components, which are not instantiated or rendered.

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 package makes it easy to grab a snapshot of the platform view hierarchy similar to a DOM tree rendered by a ReactDOM or React Native without using a browser or jsdom. ReactTestUtils are provided in the with-addons package and allow you to perform actions against a simulated DOM for the purpose of unit testing.

Jest is a JavaScript unit testing framework created by Facebook based on Jasmine and provides automated mock creation and a jsdom environment. It's often used for testing components. Finally, run yarn test or npm test and Jest will print a result:. Flux is an application design paradigm used as a replacement for the more traditional MVC pattern.

It is not a framework or a library but a new kind of architecture that complements React and the concept of Unidirectional Data Flow. Facebook uses this pattern internally when working with React. The workflow between dispatcher, stores and views components with distinct inputs and outputs as follows:.

Redux is a predictable state container for JavaScript apps based on the Flux design pattern. Redux can be used together with React, or with any other view library. It is tiny about 2kB and has no dependencies. Instead of saying downsides we can say that there are few compromises of using Redux over Flux.

Those are as follows:. Dispatching an action within a reducer is an anti-pattern. Your reducer should be without side effects , simply digesting the action payload and returning a new state object. Adding listeners and dispatching actions within the reducer can lead to chained actions and other side effects. You just need to export the store from the module where it created with createStore. Also, it shouldn't pollute the global window object.

These libraries are very different for very different purposes, but there are some vague similarities. Redux is a tool for managing state throughout the application. It is usually used as an architecture for UIs. Think of it as an alternative to half of Angular.

RxJS is a reactive programming library. It is usually used as a tool to accomplish asynchronous tasks in JavaScript. Think of it as an alternative to Promises. Redux uses the Reactive paradigm because the Store is reactive. The Store observes actions from a distance, and changes itself.

RxJS also uses the Reactive paradigm, but instead of being an architecture, it gives you basic building blocks, Observables, to accomplish this pattern. You can dispatch an action in componentDidMount method and in render method you can verify the data. Use mapStateToProps : It maps the state variables from your store to the props that you specify. Connect the above props to your container: The object returned by the mapStateToProps function is connected to the container.

You can import connect from react-redux. You need to write a root reducer in your application which delegate handling the action to the reducer generated by combineReducers. As we know, reducers are supposed to return the initial state when they are called with undefined as the first argument, no matter the action. In case of using redux-persist , you may also need to clean your storage.

First, you need to import the appropriate storage engine and then, to parse the state before setting it to undefined and clean each storage state key. The symbol is in fact a JavaScript expression used to signify decorators. Decorators make it possible to annotate and modify classes and properties at design time.

The above examples are almost similar except the usage of decorator. The decorator syntax isn't built into any JavaScript runtimes yet, and is still experimental and subject to change. You can use babel for the decorators support.

You can use Context in your application directly and is going to be great for passing down data to deeply nested components which what it was designed for. Whereas Redux is much more powerful and provides a large number of features that the Context API doesn't provide. Reducers always return the accumulation of the state based on all previous and current actions. Therefore, they act as a reducer of state. Each time a Redux reducer is called, the state and action are passed as parameters.

This state is then reduced or accumulated based on the action, and then the next state is returned. You could reduce a collection of actions and an initial state of the store on which to perform these actions to get the resulting final state. You can use redux-thunk middleware which allows you to define async actions. Keep your data in the Redux store, and the UI related state internally in the component.

The best way to access your store in a component is to use the connect function, that creates a new component that wraps around your existing one. This pattern is called Higher-Order Components , and is generally the preferred way of extending a component's functionality in React. This allows you to map state and action creators to your component, and have them passed in automatically as your store updates.

Due to it having quite a few performance optimizations and generally being less likely to cause bugs, the Redux developers almost always recommend using connect over accessing the store directly using context API. Component is a class or function component that describes the presentational part of your application. Container is an informal term for a component that is connected to a Redux store.

Containers subscribe to Redux state updates and dispatch actions, and they usually don't render DOM elements; they delegate rendering to presentational child components. Constants allows you to easily find all usages of that specific functionality across the project when you use an IDE. It also prevents you from introducing silly bugs caused by typos — in which case, you will get a ReferenceError immediately.

Normally we will save them in a single file constants. There are a few ways of binding action creators to dispatch in mapDispatchToProps. If the ownProps parameter is specified, React Redux will pass the props that were passed to the component into your connect functions. So, if you use a connected component:. Saga is like a separate thread in your application, that's solely responsible for side effects. Both call and put are effect creator functions.

Redux Thunk middleware allows you to write action creators that return a function instead of an action. The thunk can be used to delay the dispatch of an action, or to dispatch only if a certain condition is met. The inner function receives the store methods dispatch and getState as parameters. Both Redux Thunk and Redux Saga take care of dealing with side effects.

In most of the scenarios, Thunk uses Promises to deal with them, whereas Saga uses Generators. Redux DevTools is a live-editing time travel environment for Redux with hot reloading, action replay, and customizable UI. Selectors are functions that take Redux state as an argument and return some data to pass to the component. Redux Form works with React and Redux to enable a form in React to use Redux to store all of its state.

For example, you can add redux-thunk and logger passing them as arguments to applyMiddleware :. Relay is similar to Redux in that they both use a single store. The main difference is that relay only manages state originated from the server, and all access to the state is used via GraphQL queries for reading data and mutations for changing data.

Relay caches the data for you and optimizes data fetching for you, by fetching only changed data and nothing more. Actions are plain JavaScript objects or payloads of information that send data from your application to your store.

They are the only source of information for the store. Actions must have a type property that indicates the type of action being performed. React is a JavaScript library, supporting both front end web and being run on the server, for building user interfaces and web applications. React Native is a mobile framework that compiles to native app components, allowing you to build native mobile applications iOS, Android, and Windows in JavaScript that allows you to use React to build your components, and implements React under the hood.

React Native can be tested only in mobile simulators like iOS and Android. You can use console. As of React Native v0. Reselect is a selector library for Redux which uses memoization concept. It was originally written to compute derived data from Redux-like applications state, but it can't be tied to any architecture or library. If the the same inputs are provided twice in a row, Reselect returns the cached output.

It's memoization and cache are fully customizable. Flow is a static type checker designed to find type errors in JavaScript. Flow types can express much more fine-grained distinctions than traditional type systems. For example, Flow helps you catch errors involving null , unlike most type systems. 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 class of bugs at compile time.

PropTypes is a basic type checker runtime checker which has been patched onto React. It can't check anything other than the types of the props being passed to a given component. 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 as a standalone app works with other environments including Safari, IE, and React Native.

Note: The above list of advantages are purely opinionated and it vary based on the professional experience. But they are helpful as base parameters. Note: The above list of differences are purely opinionated and it vary based on the professional experience. If the website is not using React or if React fails to communicate with DevTools then it won't show up the tab. It removes the mapping between styles and components, and lets you write actual CSS augmented with JavaScript.

These two variables, Title and Wrapper , are now components that you can render just like any other react component. Relay is a JavaScript framework for providing a data layer and client-server communication to web applications using the React view layer. Starting from react-scripts 2. You can just pass --typescript option as below.

But for lower versions of react scripts, just supply --scripts-version option as react-scripts-ts while you create a new project. Let's take calculations and different amounts of a shipment order with the simplified usage of Reselect:. Redux can be used as a data store for any UI layer. Redux simply provides a subscription mechanism which can be used by any other code. You should be able to use it regardless of your JavaScript build process.

Redux also offers a UMD build that can be used directly without any build process at all. For example, the height property can be defined with either string or number type as below:. You can import SVG directly as component instead of loading it as a file. This feature is available with react-scripts 2. If the ref callback is defined as an inline function, it will get called twice during updates, first with null and then again with the DOM element.

This is because a new instance of the function is created with each render, so React needs to clear the old ref and set up the new one. But our expectation is for the ref callback to get called once, when the component mounts. One quick fix is to use the ES7 class property syntax to define the function. The concept of render hijacking is the ability to control what a component will output from another component. It means that you decorate your component by wrapping it into a Higher-Order component.

By wrapping, you can inject additional props or make other changes, which can cause changing logic of rendering. It does not actually enable hijacking, but by using HOC you make your component behave differently. It is called Inheritance Inversion because instead of the WrappedComponent extending some Enhancer class, it is passively extended by the Enhancer. In this way the relationship between them seems inverse.

It is up to the developer's decision, i. Some users prefer to keep every single piece of data in Redux, to maintain a fully serializable and controlled version of their application at all times. React creates a service worker for you without any configuration by default. It's all about adding offline capabilities to your site.

Class components can be restricted from re-rendering when their input props are the same using PureComponent or shouldComponentUpdate. Now you can do the same with function components by wrapping them in React. You can compare the current value of the state with an existing state value and decide whether to rerender the page or not. If the values are the same then you need to return null to stop re-rendering otherwise return the latest state value. Arrays : Unlike older releases, you don't need to make sure render method return a single element in React You are able to return multiple sibling elements without a wrapping element by returning an array.

Strings and Numbers: You can also return string and number type from the render method. React Class Components can be made much more concise using the class field declarations. You can initialize the local state without using the constructor and declare class methods by using arrow functions without the extra need to bind them. Let's take a counter example to demonstrate class field declarations for state without using constructor and methods without binding,.

Hooks is a new feature React The componentDidCatch lifecycle method is invoked after an error has been thrown by a descendant component. The method receives two parameters,. So if they throw, React still knows what to display on the screen. Try catch block works with imperative code whereas error boundaries are meant for declarative code to render on the screen. So if an error occurs in a componentDidUpdate method caused by a setState somewhere deep in the tree, it will still correctly propagate to the closest error boundary.

Apart from error messages and javascript stack, React16 will display the component stack trace with file names and line numbers using error boundary concept. The defaultProps are defined as a property on the component class to set the default props for the class. This is used for undefined props, but not for null props. If props.

This lifecycle method is invoked after an error has been thrown by a descendant component. It receives the error that was thrown as a parameter and should return a value to update state. Let us take error boundary use case with the above lifecycle method for demonstration purpose,. An update can be caused by changes to props or state. The below methods are called in the following order when a component is being re-rendered. Below methods are called when there is an error during rendering, in a lifecycle method, or in the constructor of any child component.

The displayName string is used in debugging messages. You might want to set it explicitly if you want to display a different name for debugging purposes or when you create a higher-order component. This method is available from react-dom package and it removes a mounted React component from the DOM and clean up its event handlers and state.

If no component was mounted in the container, calling this function does nothing. Returns true if a component was unmounted and false if there was no component to unmount. Code-Splitting is a feature supported by bundlers like Webpack and Browserify which can create multiple bundles that can be dynamically loaded at runtime.

The react project supports code splitting via dynamic import feature. For example, in the below code snippets, it will make moduleA. Skip to content. Star This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Branches Tags.

Could not load branches. Could not load tags. Latest commit. Update stateless component answer. Git stats commits. Failed to load latest commit information. Upgrade pandoc to 2. Nov 2, Bump color-string from 1. Jul 6, Add latest lifecycle methods image. Sep 12, Add ReactJS interview questions and Answers.

Jul 7, Jun 25, View code. What are the major features of React? What is JSX? What is the difference between Element and Component? How to create components in React? When to use a Class Component over a Function Component? What are Pure Components? What is state in React? What are props in React?

What is the difference between state and props? Why should we not update the state directly? What is the purpose of callback function as an argument of setState? How to bind methods or event handlers in JSX callbacks? How to pass a parameter to an event handler or callback? What are synthetic events in React? What are inline conditional expressions?

What is "key" prop and what is the benefit of using it in arrays of elements? What is the use of refs? How to create refs? What are forward refs? Which is preferred option with in callback refs and findDOMNode? Why are String Refs legacy? What is Virtual DOM? How Virtual DOM works? What is React Fiber? What is the main goal of React Fiber? What are controlled components? What are uncontrolled components? What is the difference between createElement and cloneElement?

What is Lifting State Up in React? What are the different phases of component lifecycle? What are the lifecycle methods of React? What are Higher-Order Components? How to create props proxy for HOC component? What is context? What is children prop? How to write comments in React? What is the purpose of using super constructor with props argument? What is reconciliation? How to set state with a dynamic key name? What would be the common mistake of function being called every time the component renders?

Is lazy function supports named exports? Why React uses className over class attribute? What are fragments? Why fragments are better than container divs? What are portals in React? What are stateless components? What are stateful components? How to apply validation on props in React? What are the advantages of React? What are the limitations of React? What are error boundaries in React v16? How error boundaries handled in React v15? What are the recommended ways for static type checking?

What is the use of react-dom package? What is the purpose of render method of react-dom? How to use styles in React? How events are different in React? What will happen if you use setState in constructor? What is the impact of indexes as keys? Is it good to use setState in componentWillMount method? What will happen if you use props in initial state? How do you conditionally render components? Why we need to be careful when spreading props on DOM elements?

How you use decorators in React? How do you memoize a component? How to enable production mode in React? What is CRA and its benefits? What is the lifecycle methods order in mounting? What are the lifecycle methods going to be deprecated in React v16? What is the purpose of getDerivedStateFromProps lifecycle method? What is the purpose of getSnapshotBeforeUpdate lifecycle method? Do Hooks replace render props and higher order components?

What is the recommended way for naming components? What is the recommended ordering of methods in component class? What is a switching component? Why we need to pass a function to setState? Why function is preferred over object for setState?

What is strict mode in React? What are React Mixins? Why is isMounted an anti-pattern and what is the proper solution? What are the Pointer Events supported in React? Why should component names start with capital letter?

What are the exceptions on React component naming? Are custom DOM attributes supported in React v16? What is the difference between constructor and getInitialState? Can you force a component to re-render without calling setState? What is the difference between super and super props in React using ES6 classes?

How to loop inside JSX? How do you access props in attribute quotes? What is React proptype array with shape? How to conditionally apply class attributes? How to use React label element? How to combine multiple inline style objects? How to re-render the view when the browser is resized? What is the difference between setState and replaceState methods? How to listen to state changes? What is the recommended approach of removing an array element in React state?

Why you can't update props in React? How to focus an input element on page load? What are the possible ways of updating objects in state? How can we find the version of React at runtime in the browser? What are the approaches to include polyfills in your create-react-app? How to use https instead of http in create-react-app? How to avoid using relative path imports in create-react-app? How to add Google Analytics for React Router?

How to update a component every second? How do you apply vendor prefixes to inline styles in React? How to import and export components using React and ES6? Why is a component constructor called only once? How to define constants in React? How to programmatically trigger click event in React?

What are the common folder structures for React? What are the popular packages for animation? What is the benefit of styles modules? What are the popular React-specific linters? What are render props? React Router What is React Router? How React Router is different from history library?

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