Correct javascript inheritance

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Simple: Object.create is not supported in all environments, but can be shimmed with new. Apart from that, the two have different aims: Object.create just creates a Object inheriting from some other, while new also invokes a constructor function. Use what is appropriate.

In your case you seem to want that RestModel.prototype inherits from Model.prototype. Object.create (or its shim) is the correct way then, because you do not want to a) create a new instance (instantiate a new Model) and b) don’t want to call the Model constructor:

RestModel.prototype = Object.create(Model.prototype);

If you want to call the Model constructor on RestModels, that has nothing to do with prototypes. Use call() or apply() for that:

function RestModel() {
    Model.call(this); // apply Model's constructor on the new object
    ...
}

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