JavaScript: Gather and display infromation from an object

JavaScript Object: Exercise-4 with Solution

Write a JavaScript program to display the reading status (i.e. display book name, author name and reading status) of the following books.

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<meta charset=utf-8 />
<title>Reading status of a book library</title>

JavaScript Code:

var library = [ 
        title: 'Bill Gates',
        author: 'The Road Ahead',
        readingStatus: true
        title: 'Steve Jobs',
        author: 'Walter Isaacson',
        readingStatus: true
        title: 'Mockingjay: The Final Book of The Hunger Games',
        author: 'Suzanne Collins',
        readingStatus: false

for (var i = 0; i < library.length; i++) 
    var book = "'" + library[i].title + "'" + ' by ' + library[i].author + ".";
    if (library[i].readingStatus) {
      console.log("Already read " + book);
    } else
     console.log("You still need to read " + book);

Sample Output:

Already read 'Bill Gates' by The Road Ahead.
Already read 'Steve Jobs' by Walter Isaacson.
You still need to read 'Mockingjay: The Final Book of The Hunger Games' by Suzanne Collins.


Flowchart: JavaScript - Gather and display infromation from an object.

Live Demo:

See the Pen javascript-object-exercise-4 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to get the length of an JavaScript object.
Next: Write a JavaScript program to get the volume of a Cylinder with four decimal places using object classes.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

Share this Tutorial / Exercise on : Facebook and Twitter

JavaScript: Tips of the Day


class Calc {
	constructor() {
		this.count = 0 

	increase() {
		this.count ++

const calc = new Calc()
new Calc().increase()


We set the variable calc equal to a new instance of the Calc class. Then, we instantiate a new instance of Calc, and invoke the increase method on this instance. Since the count property is within the constructor of the Calc class, the count property is not shared on the prototype of Calc. This means that the value of count has not been updated for the instance calc points to, count is still 0.

Ref: https://bit.ly/2Hcpkm6