React Questions

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112

React Questions

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1. Props are __________ into other components

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2. What is the default local host port that a React development server uses?

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3. Which of the following is the correct data flow sequence of flux concept?

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4. Consider the following code from React Router. What do you call :id in the path prop? > Route path=”/:id” / >

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5. What is the declarative way to render a dynamic list of components based on values in an array?

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6. What is the correct syntax to import a Component from React?

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7. Which is not true about Virtual DOM in React JS?

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8. What will be the output of the following code?

import React, { Component } from 'react';  
const App = () => {  
    
      return(  
          < div >  
             < h1 className = "hello" > {25+20}< /h1 >   
          < /div >  
      );   
}  
export default App;

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9.  How many ways of defining your variables in ES6?

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10. Using object literal enhancement, you can put values back into an object. When you log person to the console, what is the output?

const name = 'Rachel';
const age = 31;
const person = { name, age };
console.log(person);

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11. Which of the following function is used to change the state of the React.js component?

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12. How do you fix the syntax error that results from running this code?

const person =(firstName, lastName) =>
{
  first: firstName,
  last: lastName
}
console.log(person("Jill", "Wilson"))

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13.  React.js is written in which of the following language?

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14. How can you combine the following arrays using the spread operator?

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15. React.js was Initially released in …………….

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Written by Shubhranshu Shekhar, who has trained 20000+ students in coding.