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This allows you to dynamically change object definitions
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Consider the function (constructor)
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function car(make, model) {
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this.make = make;
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this.color = 'red';
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this.model = model;
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}
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mycar = new car("Ford", "Explorer");
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Suppose we wanted to add a new property fourwheel
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car.prototype.fourwheel = false;
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mycar.fourwheel = true;
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We can add methods with
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function repaint(newcolor) { this.color = newcolor; }
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car.prototype.repaint = repaint;
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We can avoid repainting mycar by assigning
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mycar.repaint = specialrepaint;
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function specialrepaint(newcolor) {}
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