When using the Backbone.js framework with model defaults that contain arrays or objects, defaults should be defined as a
function rather than an object. This is because objects and arrays are passed by reference in JavaScript. So a defaults object that
contains arrays or objects is going to set the default value of every instance to point to the same shared object or array.
Use a function instead and a fresh copy of the object or array will be peeled off for each instance.
var Person = Backbone.Model.extend({
defaults: { // Noncompliant; every instance of Person will share the same instance of favoriteColors
favoriteColors: ["blue","purple","raspberry"]
}
});
var Person = Backbone.Model.extend({
defaults: function() {
return {
favoriteColors: ["blue","purple","raspberry"]
};
}
});