Clean Backbone

gistfile1.js

Collection1 = Backbone.Collection.extend({
	initialize: function(models, options){
		// bad, causes things to crash if options.that doesn’t get passed.
		this.doSomethingWithThat(options.that);
	}
});

// Crashes since 'that' is not set
collection1 = new Collection1();

Collection2 = Backbone.Collection.extend({
	initialize: function(models, options){
		// good, causes things to crash if options.that doesn’t get passed.
		var that = options.that || 'defaultThatValue';
		this.doSomethingWithThat(options.that);
	}
});

// Success providing doSomethingWithThat supports the defualt
collection2 = new Collection2();

gistfile2.js

View1 = Backbone.View.extend({
	sampleFunction: function () {}
});

View2 = Backbone.View.extend({
	sampleFunction: function () {
		// Wrong since View1 is not the prototype of View2
		View1.prototype.sampleFunction();
	}
});

View3 = View1.extend({
	sampleFunction: function () {
		// Right since View1 is the prototype of View3
		View1.prototype.sampleFunction();
	}
});