Can I set the type of a Javascript object?

Question

I\'m trying to use some of the more advanced OO features of Javascript, following Doug Crawford\'s \"super constructor\" pattern. However, I don\'t know how to set and get types

Answer 1

If you declare Bicycle like this, instanceof will work:

function Bicycle(tires) {
  this.tires = tires;
  this.toString = function () {
    return 'Bicycle with ' + tires + ' tires.';
  }
}

var b = new Bicycle(2);
console.log(b instanceof Bicycle);