class Book{
constructor(title, author, isbn, numCopies){
this.title=title;
this.author=author;
this.isbn=isbn;
this.numCopies=numCopies;
}
get availability(){
return this.getAvailability();
}
getAvailability= ()=>{
if (this.numCopies===0){
return "out of stock";
}
if(this.numCopies<10){
return "low stock";
}
return "in stock";
}
sell= (numSold=1)=>{
if(numSold<this.numCopies||numSold===this.numCopies){
this.numCopies-=numSold;
}
else{
if(this.numCopies>0){
this.numCopies-=1;
}
}
}
restock= (numCopies=5)=>{
this.numCopies+=numCopies;
return this;
}
}
const HungerGames = new Book("Hunger Games","Suzanne Collins", 123919, 5);
console.log(HungerGames.availability);
HungerGames.restock(120);
console.log(HungerGames.availability);
HungerGames.sell(17);
console.log(HungerGames.availability);
