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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | 10x 10x 10x 10x 3x 3x 3x 1x 2x 1x 1x 4x 2x | // Inventory application for book store
// create book with title, author, isbn, numCopies
// getAvailability => no book out of stock, < 10 low stock & in stock otherwise
// sell(numSold = 1) if no numSold, sold is one
// restock(numCopies = 5)
/**
* Represents a book
* @constructor
*/
export default class BookInventory{
constructor({title, author, isbn, numCopies}){
this.title = title;
this.author = author;
this.isbn = isbn;
this.numCopies = numCopies;
}
get availability(){
return this.getAvailability();
}
/**
* Method to know the book availability
* 0 copies - 'out of stock'
* less than 10 copies - 'low stock'
* more than 10 copies - 'in stock'
* returns string that represents number of copies available
*/
getAvailability(){
let numCopies = this.numCopies;
if(numCopies === 0){
return 'out of stock';
}
else if(numCopies < 10){
return 'low stock';
}
else{
return 'in stock';
}
}
/**
* Method to sell the book
* @param numSold - integer of number of copies sold, default to 1
* returns undefined
*/
sell(numSold = 1){
this.numCopies -= numSold;
}
/**
* Method to restock the book
* @param numCopies - integer of number of copies restocked, default to 5
* returns undefined
*/
restock(numCopies = 5){
this.numCopies += numCopies;
}
}
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