knockout (3.0 - 3.1): foreach vs virtual foreach

JavaScript performance comparison

Revision 2 of this test case created by

Preparation code 

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<!--<script src="http://knockoutjs.com/downloads/knockout-3.1.0.js"></script>-->
 <script src="http://knockoutjs.com/downloads/knockout-3.0.0.js"></script> 

<script type="text/html" id="template1">
<div><div data-bind="text: $data.Name() + 'template1'"></div></div>
</script>
<script type="text/html" id="template2">
<div><div data-bind="text: $data.Name() + 'template2'"></div></div>
</script>


<div id="simpleContainerWithTemplate" data-bind="foreach: items">
<div data-bind="template: { name: templateName, foreach: items }"></div>
</div>

<div id="virtualContainerWithTemplate">
<!-- ko: foreach: items -->

<!-- ko: if: $index%2 == 0 -->
<div><div data-bind="text: $data.Name"></div></div>
<!-- /ko -->

<!-- ko: if: $index%2 != 0 -->
<div><div data-bind="text: $data.Name"></div></div>
<!-- /ko -->

<!-- /ko -->
</div>



<div id="simpleContainer" data-bind="foreach: items">
<div data-bind="text: $data.Name"></div>
</div>

<div id="virtualContainer">
<!-- ko: foreach: items -->
<div data-bind="text: $data.Name"></div>
<!-- /ko -->
</div>


<script>

var Item = function(data) {
  var self = this;
  self.Name = ko.observable(data.Name);
};


function TestModel() {
  var self = this;

self.items = ko.observableArray();

self.templateName = function (i) {

if (i.Name()%2 == 0) 
return 'template1';

return 'template2';
};
(function () {
 self.update = function() {

	var temp = [];
	for (var i = 0; i < 100; i++) {
		temp.push(new Item({ Name: "name_" + i}));
	}
	self.items(temp);
temp.length = 0;
};
});
};


</script>

Preparation code output

<!--<script src="http://knockoutjs.com/downloads/knockout-3.1.0.js"></script>--> <script src="http://knockoutjs.com/downloads/knockout-3.0.0.js"></script> <script type="text/html" id="template1"> <div><div data-bind="text: $data.Name() + 'template1'"></div></div> </script> <script type="text/html" id="template2"> <div><div data-bind="text: $data.Name() + 'template2'"></div></div> </script> <div id="simpleContainerWithTemplate" data-bind="foreach: items"> <div data-bind="template: { name: templateName, foreach: items }"></div> </div> <div id="virtualContainerWithTemplate"> <!-- ko: foreach: items --> <!-- ko: if: $index%2 == 0 --> <div><div data-bind="text: $data.Name"></div></div> <!-- /ko --> <!-- ko: if: $index%2 != 0 --> <div><div data-bind="text: $data.Name"></div></div> <!-- /ko --> <!-- /ko --> </div> <div id="simpleContainer" data-bind="foreach: items"> <div data-bind="text: $data.Name"></div> </div> <div id="virtualContainer"> <!-- ko: foreach: items --> <div data-bind="text: $data.Name"></div> <!-- /ko --> </div> <script> var Item = function(data) { var self = this; self.Name = ko.observable(data.Name); }; function TestModel() { var self = this; self.items = ko.observableArray(); self.templateName = function (i) { if (i.Name()%2 == 0) return 'template1'; return 'template2'; }; (function () { self.update = function() { var temp = []; for (var i = 0; i < 100; i++) { temp.push(new Item({ Name: "name_" + i})); } self.items(temp); temp.length = 0; }; }); }; </script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
simple 
var mod = new TestModel();
ko.cleanNode($('#simpleContainer')[0]);
ko.applyBindings(mod, $('#simpleContainer')[0]);
 pending…
virtual 
var mod = new TestModel();
ko.cleanNode($('#virtualContainer')[0]);
ko.applyBindings(mod, $('#virtualContainer')[0]);
 pending…
simple with templates 
var mod = new TestModel();
ko.cleanNode($('#simpleContainerWithTemplate')[0]);
ko.applyBindings(mod, $('#simpleContainerWithTemplate')[0]);
 pending…
virtual like with templates 
var mod = new TestModel();;
ko.cleanNode($('#virtualContainerWithTemplate')[0]);
ko.applyBindings(mod, $('#virtualContainerWithTemplate')[0]);
 pending…

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