# 14. Learn backbone.js tutorial from scratch for beginners(Part 17) Collection in backbone js

![](/files/-MS4M5SCy-vW4PGLmlbZ)

![](/files/-MS65RSAn0q7bAqHHB3X)

```
1. A collection is a ordered set of models
2. It is used to deal with a group of related models
3. It handles the loading and saving of new models to the server
4. It provides helper functions to perform aggregation and computation against a list of models
5. You can create your own collection by extending the backbone's collection class
```

![](/files/-MS6ANH6cHIKT_JgSeTY)

C:\Users\Administrator\Desktop\gulp\app.js

```
jQuery(document).ready(function($) {
  var FirstModel = Backbone.Model.extend({
  	defaults: {
  		name: 'Lionel',
  		team: "Viet Nam",
  		no: 10
  	}
  });
  
  var model1 = new FirstModel({
  	name: 'Lionel 1',
  	team: "Viet Nam",
  	no: 16
  });
  var model2 = new FirstModel({
  	name: 'Lionel 2',
  	team: "Viet Nam",
  	no: 17
  });
  var model3 = new FirstModel({
  	name: 'Lionel 3',
  	team: "Viet Nam",
  	no: 18
  });
  var MyCollection =  Backbone.Collection.extend({
  	model: FirstModel
  });
  var MycollectionObj = new MyCollection(model1);
  var ModelView = Backbone.View.extend({
  	collection: MycollectionObj,
  	initialize: function() {
  		this.render();
  	},
  	render: function() {	
  		console.log(this.collection.toJSON());
  	}
  });
  vmodel = new ModelView();
});
```

![](/files/-MS6AoSV4frIoy8EHRMg)

C:\Users\Administrator\Desktop\gulp\app.js

```
jQuery(document).ready(function($) {
  var FirstModel = Backbone.Model.extend({
  	defaults: {
  		name: 'Lionel',
  		team: "Viet Nam",
  		no: 10
  	}
  });
  
  var model1 = new FirstModel({
  	name: 'Lionel 1',
  	team: "Viet Nam",
  	no: 16
  });
  var model2 = new FirstModel({
  	name: 'Lionel 2',
  	team: "Viet Nam",
  	no: 17
  });
  var model3 = new FirstModel({
  	name: 'Lionel 3',
  	team: "Viet Nam",
  	no: 18
  });
  var MyCollection =  Backbone.Collection.extend({
  	model: FirstModel
  });
  var MycollectionObj = new MyCollection([model1,model2,model3]);
  var ModelView = Backbone.View.extend({
  	collection: MycollectionObj,
  	initialize: function() {
  		this.render();
  	},
  	render: function() {	
  		console.log(this.collection.toJSON());
  	}
  });
  vmodel = new ModelView();
});
```

![](/files/-MS6CqoWU8tLiunH0GUy)

C:\Users\Administrator\Desktop\gulp\app.js

```
jQuery(document).ready(function($) {
  var FirstModel = Backbone.Model.extend({
  	defaults: {
  		name: 'Lionel',
  		team: "Viet Nam",
  		no: 10
  	}
  });
  
  var model1 = new FirstModel({
  	name: 'Lionel 1',
  	team: "Viet Nam",
  	no: 16
  });
  var model2 = new FirstModel({
  	name: 'Lionel 2',
  	team: "Viet Nam",
  	no: 17
  });
  var model3 = new FirstModel({
  	name: 'Lionel 3',
  	team: "Viet Nam",
  	no: 18
  });
  var MyCollection =  Backbone.Collection.extend({
  	model: FirstModel
  });
  var MycollectionObj = new MyCollection([model1,model2,model3]);
  var ModelView = Backbone.View.extend({
  	collection: MycollectionObj,
  	initialize: function() {
  		this.render();
  	},
  	render: function() {	
  		_.each(this.collection.toJSON(), function(model) {
  			console.log("Name: " + model.name + ",Team: " + model.team + ",Number is: " + model.no);
  		});
  	}
  });
  vmodel = new ModelView();
});
```


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