Backbone.Model getters/setter for default attributes

gistfile1.js

/**
 * Defines getter/setter properties using Backbone.Model defaults
 * @param  {Function} ctor constructor of Bakcbone.Model
 */
function defaultProperties(ctor) {
    if (!ctor.prototype.defaults)
        return;
    var defattr = function(name) {
        Object.defineProperty(ctor.prototype, name, {
            get: function() {
                return this.get(name);
            },
            set: function(val) {
                var diff = {};
                diff[name] = val;
                return this.set(diff);
            }
        });
    };
    for (var attr in ctor.prototype.defaults) {
        if (ctor.prototype.defaults.hasOwnProperty(attr))
            defattr(attr);
    }
}