<![CDATA[React собеседование, вопросы и ответы часть 1]]> No. Questions Core React 1 Что такое ReactJS 2 История развития ReactJS 3 What are the major features of React? 4 What is JSX? 5 What is the difference between an Element and a Component? 6 How do you create components in React? 7 When should you use a Class Component over a Function Component? 8 What are Pure Components? 9 What is state in React? 10 What are props in React? 11 What is the difference between state and props? 12 What is the difference between HTML and React event handling? 13 What are synthetic events in React? 14 What are inline conditional expressions? 15 What is the “key” prop and what is its benefit when used in arrays of elements? 16 What is the Virtual DOM? 17 How does the Virtual DOM work? 18 What is the difference between Shadow DOM and Virtual DOM? 19 What is React Fiber? 20 What is the main goal of React Fiber? 21 What are controlled components? 22 What are uncontrolled components? 23 What is the difference between createElement and cloneElement? 24 What is Lifting State Up in React? 25 What are Higher-Order Components? 26 What is the children prop? 27 How do you write comments in React? 28 What is reconciliation? 29 Does the lazy function support named exports? 30 Why does React use className instead of the class attribute? 31 What are Fragments? 32 Why are Fragments better than container divs? 33 What are portals in React? 34 What are stateless components? 35 What are stateful components? 36 How do you apply validation to props in React? 37 What are the advantages of React? 38 What are the limitations of React? 39 What are the recommended ways for static type checking? 40 What is the use of the react-dom package? 41 What is ReactDOMServer? 42 How do you use innerHTML in React? 43 How do you apply styles in React? 44 How are events different in React? 45 What is the impact of using indexes as keys? 46 How do you conditionally render components? 47 Why do we need to be careful when spreading props on DOM elements? 48 How do you memoize a component? 49 How do you implement Server-Side Rendering (SSR)? 50 How do you enable production mode in React? 51 Do Hooks replace render props and higher-order components? 52 What is a switching component? 53 What are React Mixins? 54 What are the pointer events supported in React? 55 Why should component names start with a capital letter? 56 Are custom DOM attributes supported in React v16? 57 How do you loop inside JSX? 58 How do you access props within attribute quotes? 59 What is a React PropType array with shape? 60 How do you conditionally apply class attributes? 61 What is the difference between React and ReactDOM? 62 Why is ReactDOM separated from React? 63 How do you use the React label element? 64 How do you combine multiple inline style objects? 65 How do you re-render the view when the browser is resized? 66 How do you pretty-print JSON with React? 67 Why can’t you update props in React? 68 How do you focus an input element on page load? 69 How can you find the version of React at runtime in the browser? 70 How do you add Google Analytics for React Router? 71 How do you apply vendor prefixes to inline styles in React? 72 How do you import and export components using React and ES6? 73 What are the exceptions to React component naming? 74 Is it possible to use async/await in plain React? 75 What are common folder structures for React? 76 What are popular packages for animation? 77 What are the benefits of style modules? 78 What are popular React-specific linters? React Router 79 What is React Router? 80 How is React Router different from the history library? 81 What are the components of React Router v6? 82 What is the purpose of the push and replace methods of history? 83 How do you programmatically navigate using React Router v4? 84 How do you get query parameters in React Router v4? 85 Why do you get a “Router may have only one child element” warning? 86 How do you pass params to the history.push method in React Router v4? 87 How do you implement a default or NotFound page? 88 How do you get history in React Router v4? 89 How do you perform an automatic redirect after login? React Internationalization 90 What is React Intl? 91 What are the main features of React Intl? 92 What are the two ways of formatting in React Intl? 93 How do you use FormattedMessage as a placeholder with React Intl? 94 How do you access the current locale with React Intl? 95 How do you format a date using React Intl? React Testing 96 What is the Shallow Renderer in React testing? 97 What is the TestRenderer package in React? 98 What is the purpose of the ReactTestUtils package? 99 What is Jest? 100 What are the advantages of Jest over Jasmine? 101 Can you give a simple example of a Jest test case? React Redux 102 What is Flux? 103 What is Redux? 104 What are the core principles of Redux? 105 What are the downsides of Redux compared to Flux? 106 What is the difference between mapStateToProps() and mapDispatchToProps()? 107 Can you dispatch an action in a reducer? 108 How do you access the Redux store outside a component? 109 What are the drawbacks of the MVW pattern? 110 Are there any similarities between Redux and RxJS? 111 How do you reset state in Redux? 112 What is the difference between React Context and React Redux? 113 Why are Redux state functions called reducers? 114 How do you make an AJAX request in Redux? 115 Should you keep all component states in the Redux store? 116 What is the proper way to access the Redux store? 117 What is the difference between a component and a container in React Redux? 118 What is the purpose of constants in Redux? 119 What are the different ways to write mapDispatchToProps()? 120 What is the use of the ownProps parameter in mapStateToProps() and mapDispatchToProps()? 121 How do you structure Redux top-level directories? 122 What is Redux Saga? 123 What is the mental model of Redux Saga? 124 What are the differences between call and put in Redux Saga? 125 What is Redux Thunk? 126 What are the differences between Redux Saga and Redux Thunk? 127 What is Redux DevTools? 128 What are the features of Redux DevTools? 129 What are Redux selectors and why should you use them? 130 What is Redux Form? 131 What are the main features of Redux Form? 132 How do you add multiple middlewares to Redux? 133 How do you set the initial state in Redux? 134 How is Relay different from Redux? 135 What is an action in Redux? React Native 136 What is the difference between React Native and React? 137 How do you test React Native apps? 138 How do you log in React Native? 139 How do you debug React Native apps? React Supported Libraries and Integration 140 What is Reselect and how does it work? 141 What is Flow? 142 What is the difference between Flow and PropTypes? 143 How do you use Font Awesome icons in React? 144 What is React DevTools? 145 Why does DevTools not load in Chrome for local files? 146 How do you use Polymer in React? 147 What are the advantages of React over Vue.js? 148 What is the difference between React and Angular? 149 Why is the React tab not showing up in DevTools? 150 What are styled-components? 151 Can you give an example of styled-components? 152 What is Relay?

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