Exercise 1: Class Implementation
Test your class implementation skills by solving this challenge.
We'll cover the following
Problem statement
Implement a class Book
in JavaScript that produces the expected result as given in the sample input and output section. Some steps involved in class implementation are given below.
- Define the constructor.
- Define the class methods.
- Define the properties.
The object of the Book
class is instantiated like so:
const book = new Book('Who Moved My Cheese?', 'Spencer Johnson', 96);
Sample input and output
The book
object should be able to give the following results given in the output column on the respective input calls.
Input | Output |
---|---|
console.log(book.title); |
Who Moved My Cheese |
console.log(book.pages); |
96 |
try { book.pages = 96; } catch(ex) { console.log(ex.message); } |
Cannot set property pages of #< Book> which has only a getter |
console.log(book.copiesSold); |
0 |
book.copiesSold = 1; console.log(book.copiesSold); |
1 |
try { book.copiesSold = -2; } catch(ex) { console.log(ex.message);} |
Value can’t be negative |
console.log(book.copiesSold); |
1 |
Exercise
Complete this exercise to test your knowledge and skills of class implementation.
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