React.js Test

React js Linkedin assessment

If you wanted to import just the Component from the React library, what syntax do you use?

• import React.Component from 'react'
• import { Component } from 'react'
• import Component from 'react'
• import [ Component ] from 'react'

React Linkedin test 

If a function component should always render the same way given the same props, what is a simple performance optimization available for it?

•  Implement the useReducer Hook.
•  Implement the shouldComponentUpdate lifecycle method.
•  Implement the useMemo Hook.
• Wrap it in the React.memo higher-order component.

Reactjs Linkedin assessment

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"));

•   Replace the object with an array.
•   Call the function from another file.
•   Wrap the object in parentheses.
•    Add a return statement before the first curly brace.

Linkedin Reactjs Quiz

If you see the following import in a file, what is being used for state management in the component?

import React, { useState } from "react";

•      React Hooks
•      stateful components
•      math
•     class components

Linkedin React js assessment answers 

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); 

•        {name: "Rachel", age: 31}
•        {person: {name: "Rachel", age: 31}}
•        {person: "Rachel", person.age: 31}
•        {{name: "Rachel", age: 31}}

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