Question

How to create a new primitive or object where I can use the operators used in Number?

I want to create a new object like Number, with a different name, another properties and where I can to use the operators i.e. 4+5

Answer 1

You can override an objects valueOf prototype to create your own primitive:

var N = function(n) {
    this._value = n;
}
N.prototype.valueOf = function() {
    return this._value+1;
};
console.log( new N(4) + 4 ); // 9

See examples and more info here: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/valueOf