Answer 1

https://code.sololearn.com/WR2cqush1vBM/?ref=app

Answer 2

roughly, there are two ways to make an object in javascript...

in your code, you use the 'literal' way ( obj = { /* properties, methods */ } ), so you made one Object instance.

the alternate way is to use a constructor function.
equivalent of literal declaration would be:

obj = new Object();
obj.property = ...;

or with a custom contructor:

function CustomObj(arg1,arg2,...) {
// initialization of 'this' object with properties and methods
}
CustomObj.prototype.methodOrProperty = ...;

methods (or properties) defined on prototype will be shared across different CustomObj instances (properties of prototype can be accessed through instance, but write will occurs on instance: often prototype hold only methods, and instance hold only properties).

Then you can create an instance with:

myObj = new CustomObj(42,"forty-two",...);

Obviously, there are a lot of workaround to make a new instance (class syntaxic sugar, Object.create static method...)