Editing JavaScript template language shootoff

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A limited comparison of some popular JavaScript templating engines on a short template: ***6 header tags, and 10 list items***. Compared templating engines:

- [Mustache](http://mustache.github.com/)
- [jQuery Templates](http://api.jquery.com/category/plugins/templates/)
- [Kendo UI Templates](http://demos.kendoui.com/templates/index.html)
- [Handlebar](http://www.handlebarsjs.com/)
- [Resig Micro-Templating (modified)](http://ejohn.org/blog/javascript-micro-templating/)
- [Underscore JS](http://documentcloud.github.com/underscore/)

##Understanding Kendo UI Template Performance##
It's not magic. Through careful performance testing, we have found that string concatenation (+=) outside of a "with" block is significantly faster than JavaScript array push/join operations in a "with" block. This helps Kendo UI Templates run as fast as possible. Additional optimizations are coming soon to make performance in a "with" block better, too.

[More on Kendo UI Templates](http://demos.kendoui.com/templates/index.html)

*Note: When adding a new test, please ensure that your test returns the same HTML string (or equivalent DOM fragment) as the others.*

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

<script src="http://ajax.cdnjs.com/ajax/libs/mustache.js/0.3.0/mustache.min.js"></script>

<script src="http://ajax.microsoft.com/ajax/jquery.templates/beta1/jquery.tmpl.min.js"></script>

<script type="text/x-kendo-template" id="kendoUIextTemplate">
<div>
<h1 class='header'><#= data.header #></h1>
<h2 class='header2'><#= data.header2 #></h2>
<h3 class='header3'><#= data.header3 #></h3>
<h4 class='header4'><#= data.header4 #></h4>
<h5 class='header5'><#= data.header5 #></h5>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>

<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<h6 class='header6'><#= data.header6 #></h6>
<ul class='list'>
   <# for (var i = 0, l = data.list.length; i < l; i++) { #>
   <li class='item'><#= data.list[i] #></li>
   <# } #>
</ul>
</div>
</script>
<script>
  window.sharedVariables = {
   header: "Header",
   header2: "Header2",
   header3: "Header3",
   header4: "Header4",
   header5: "Header5",
   header6: "Header6",
   list: ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10']
  };
  
  window.jQueryTemplate = $.template(null, "<div><h1 class='header'>{{html header}}</h1><h2 class='header2'>{{html header2}}</h2><h3 class='header3'>{{html header3}}</h3><h4 class='header4'>{{html header4}}</h4><h5 class='header5'>{{html header5}}</h5><h6 class='header6'>{{html header6}}</h6><ul class='list'>{{each list}}<li class='item'>{{html $value}}</li>{{/each}}</ul></div>");
  
  window.mustacheTemplate = "<div><h1 class='header'>{{{header}}}</h1><h2 class='header2'>{{{header2}}}</h2><h3 class='header3'>{{{header3}}}</h3><h4 class='header4'>{{{header4}}}</h4><h5 class='header5'>{{{header5}}}</h5><h6 class='header6'>{{{header6}}}</h6><ul class='list'>{{#list}}<li class='item'>{{{.}}}</li>{{/list}}</ul></div>";
  
  window.handlebarsTemplate = Handlebars.compile("<div><h1 class='header'>{{header}}</h1><h2 class='header2'>{{header2}}</h2><h3 class='header3'>{{header3}}</h3><h4 class='header4'>{{header4}}</h4><h5 class='header5'>{{header5}}</h5><h6 class='header6'>{{header6}}</h6><ul class='list'>{{#each list}}<li class='item'>{{this}}</li>{{/each}}</ul></div>");
  
  window.kendouiTemplate = kendo.template("<div><h1 class='header'><#= data.header #></h1><h2 class='header2'><#= data.header2 #></h2><h3 class='header3'><#= data.header3 #></h3><h4 class='header4'><#= data.header4 #></h4><h5 class='header5'><#= data.header5 #></h5><h6 class='header6'><#= data.header6 #></h6><ul class='list'><# for (var i = 0, l = data.list.length; i < l; i++) { #><li class='item'><#= data.list[i] #></li><# } #></ul></div>", {useWithBlock:true});
  
  window.kendouiTemplate2 = kendo.template("<div><h1 class='header'><#= data.header #></h1><h2 class='header2'><#= data.header2 #></h2><h3 class='header3'><#= data.header3 #></h3><h4 class='header4'><#= data.header4 #></h4><h5 class='header5'><#= data.header5 #></h5><h6 class='header6'><#= data.header6 #></h6><ul class='list'><# for (var i = 0, l = data.list.length; i < l; i++) { #><li class='item'><#= data.list[i] #></li><# } #></ul></div>", {useWithBlock:false});
  
  //Use external template definition
  window.kendoUIAlt = kendo.template($("#kendoUIextTemplate").html());
  window.kendoUIAlt2 = kendo.template($("#kendoUIextTemplate").html(), {useWithBlock:false});
  
  window.underscoreTemplate = _.template("<div><h1 class='header'><%= header %></h1><h2 class='header2'><%= header2 %></h2><h3 class='header3'><%= header3 %></h3><h4 class='header4'><%= header4 %></h4><h5 class='header5'><%= header5 %></h5><h6 class='header6'><%= header6 %></h6><ul class='list'><% for (var i = 0, l = list.length; i < l; i++) { %><li class='item'><%= list[i] %></li><% } %></ul></div>");
  
  window.baseHtml = "<div><h1 class='header'></h1><h2 class='header2'></h2><h3 class='header3'></h3><h4 class='header4'></h4><h5 class='header5'></h5><h6 class='header6'></h6><ul class='list'><li class='item'></li></ul></div>";
  
  //Resig Template Function (modified to support ')
  function tmpl(str) {
              var strFunc =
              "var p=[];" +
                          "with(obj){p.push('" +
  
              str.replace(/[\r\t\n]/g, " ")
                 .replace(/'(?=[^#]*#>)/g, "\t")
                 .split("'").join("\\'")
                 .split("\t").join("'")
                 .replace(/<#=(.+?)#>/g, "',$1,'")
                 .split("<#").join("');")
                 .split("#>").join("p.push('")
                 + "');}return p.join('');";
  
              return new Function("obj", strFunc);
          }
  
  window.resig = tmpl("<div><h1 class='header'><#= header #></h1><h2 class='header2'><#= header2 #></h2><h3 class='header3'><#= header3 #></h3><h4 class='header4'><#= header4 #></h4><h5 class='header5'><#= header5 #></h5><h6 class='header6'><#= header6 #></h6><ul class='list'><# for (var i = 0, l = list.length; i < l; i++) { #><li class='item'><#= list[i] #></li><# } #></ul></div>");
  
  //Resig modified template function (no "with" block)
  function tmpl2(str) {
              var strFunc =
              "var p=[];" +
                          "p.push('" +
  
              str.replace(/[\r\t\n]/g, " ")
                 .replace(/'(?=[^#]*#>)/g, "\t")
                 .split("'").join("\\'")
                 .split("\t").join("'")
                 .replace(/<#=(.+?)#>/g, "',$1,'")
                 .split("<#").join("');")
                 .split("#>").join("p.push('")
                 + "');return p.join('');";
  
              return new Function("data", strFunc);
          }
  
  window.resig2 = tmpl2("<div><h1 class='header'><#= data.header #></h1><h2 class='header2'><#= data.header2 #></h2><h3 class='header3'><#= data.header3 #></h3><h4 class='header4'><#= data.header4 #></h4><h5 class='header5'><#= data.header5 #></h5><h6 class='header6'><#= data.header6 #></h6><ul class='list'><# for (var i = 0, l = data.list.length; i < l; i++) { #><li class='item'><#= data.list[i] #></li><# } #></ul></div>");
</script>

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ)

Editing JavaScript template language shootoff

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