REACT NATIVE QUIZ DESCRIPTION Total Questions −30 00 Max Time − 15:00 Which of the following method refers to the parent class in React.js? inherits() self() super() this() Which of the following acts as the input of a class-based component? Class Factory Render Props What does props stand for? Proper Arguments Properties Proper Return Values All of the above Which of the following is a correct definition of state in react? A persistent storage An internal data store (object) of component Both None What is a state in React? A permanent storage. Internal storage of the component. External storage of the component. None of the above. React is also known as _____. ReactJS js Both A. and B. None of these In ES6 – Which keyword is used for class inheritance? extends extend inheritance inheritances What does ReactJS use to increase performance? Virtual DOM Original DOM Local DOM None of the Above In ES6 – The class properties are assigned inside a _____ method. props() properties() constructor() react-properties() Why is the usage of setState? Invoke code after the setState operation is done. Replace the state completely instead of the default merge action. Access the previous state before the setState operation. None of the above. What will happen if you render an input element with disabled = {false}? It will be rendered as disabled It will not be rendered at all It will be rendered as enabled . You cannot set it false. In ES6 – What is the correct syntax of class inheritance? class class1 extends class2{...} class class1 extends | class2{...} class class1 | extends class2{...} class class1 | extends | class2{...} What is the declarative way to render a dynamic list of components based on values in an array? Using the reduce array method Using the <Each /> component Using the Array.map() method With a for/while loop In ES6 – Which keyword is used to initiate a class? function class ReactClass ReactClassJs ReactJS uses _____ to increase performance Virtual DOM Original DOM Both of above None of above Which statement is true for props? it is set and updated by the object can be modified it is mutual can’t be modified In which of the following condition, the React.js Lifecycle method static getDerivedSateFromProps(props, state) is called? The component is created for the first time. The state of the component is updated. Both of the above. None of the above. For controlled components in react Source of truth is DOM Source of truth is component state Source of truth can be anything None of above For uncontrolled components in react Source of truth is DOM Source of truth is component state Source of truth can be anything None of above Which ReactJS command is used to create a new application? create-react-app new-react-app create-new-reactapp react-app With an arrow function – this keyword represents _____. Content Header object Current object Child object Which of the following statement is true for uncontrolled components in React.js? The source of truth is DOM. The source of truth is a component state. The source of truth can be anything. None of the above. What is the use of the create-react-app command in the React.js application? It is used to update a React app. It is used to create a new React app. It is used to install dependencies. None of the above. In ES6 – A class is a type of ____. Basic datatype Derived datatype Variable Function A valid react component can return ...... number of elements. 1 2 3 None of the Above Which of the following command is used to install create-react-app? Play Videox npm install -g create-react-app npm install create-react-app npm install -f create-react-app install -g create-react-app Ref in react component is used to assign reference to DOM elements. Ref can be created by Calling React.createRef method Assigning a value to ref attribute in JSX Both of above None of above Can we use React native for web? Yes NO React Js is developed by Google Microsoft Facebook None of above A class component must include the _______ statement. extends React.Component extends React extends Component extends React.Component.All Previous Next Total Question16 Wrong Answer13 Right Answer13
