Creating Object map in node.js

Creating an Object map in node.js and how can we access the static and dynamic objects.

Suppose we have a Object Map like below:

var myBooks = {
"fiction":{
copies:200,
cost:"$1000"
},
"non-fiction":{
copies:100,
cost:"$1200"
},
"fantasy":{
copies:300,
cost:"$2000"
},
}

When you run above code, it will print below output i.e array of the objects.

So here, using dot(.) operator we can access the array of objects.

console.log(myBooks.fiction);
console.log(myBooks.fiction.copies);

The above code will print the following output:

{ copies: 200, cost: ‘$6,000’ }  //first console.log
200 //second console.log

But what if i do not know the object i have to access?

Here is how we can get the object values then,

var choice = "fantasy";

console.log(myBooks[choice].copies);

This will produce output as 300