Solution for Rosetta Code: Define a primitive data type

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#1

What is your hint or solution suggestion?
A type helps group similar values on which common operations can be performed. The error messages are defined using the TypeError() function based on certain conditions. Set the integer to this._value, then return it using the Num.prototype.valueOf method.

Solution 1 
function Num(n){
    if(isNaN(n))
        throw new TypeError("Not a Number");
    if(n < 1 || n > 10)
        throw new TypeError("Out of range");
    this._value = n;
}
Num.prototype.valueOf = function() { return this._value; }
Num.prototype.toString = function () { return this._value.toString();}

Challenge: Define a primitive data type

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#2