JavaScript template language shootoff

JavaScript performance comparison

Revision 231 of this test case created

Info

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

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

Understanding MyTemplate Performance

Actually, there's really no secret sauce, just generate simple-yet-performant-javascript (tm). For extra credits, check out the source of the compiled template (templateFunction.toString()) and look at the generated code and you'll see why there really is no secret sauce. And once you've done that, explain why almost identical code can perform differently.

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

Preparation code

<script>
(function() {
/* My Template
 * Copyleft Mikael Karon <mikael@karon.se>, Kates Gasis <katesgasis@gmail.com>.
 * Published under a BSD licence
 */

        var RE_BLOCK = /<%(=)?([\S\s]*?)%>/g;
        var RE_TOKENS = /<%(\d+)%>/gm;
        var RE_REPLACE = /(["\n\t\r])/gm;
        var RE_CLEAN = /o \+= "";| \+ ""/gm;
        var REPLACE = {
                "\"": "\\\"",
                "\n": "\\n",
                "\t": "\\t",
                "\r": "\\r"
        };
       
        window.compileTemplate = function(body) {
                        var blocks = [];
                        var length = 0;

                        function blocksTokens (original, prefix, block) {
                                blocks[length] = prefix
                                        ? "\" +" + block + "+ \""
                                        : "\";" + block + "o += \"";

                                return "<%" + String(length++) + "%>";
                        }

                        function tokensBlocks (original, token) {
                                return blocks[token];
                        }

                        function replace(original, token) {
                                return REPLACE[token] || token;
                        }
                       
                        return new Function("data", ("var o; o = \"" + body
                                        // Replace script blocks with tokens
                                        .replace(RE_BLOCK, blocksTokens)

                                        // Replace unwanted chars
                                        .replace(RE_REPLACE, replace)

                                        // Replace tokens with script blocks
                                        .replace(RE_TOKENS, tokensBlocks)

                                        + "\"; return o;")

                                        // Cleans
                                        .replace(RE_CLEAN, ""));
        }
})();
</script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

<script src="http://documentcloud.github.com/underscore/underscore.js"></script>

<!--NOTE: Need to load from CDNJS since GitHub uses text/plain MIME type, which is blocked in IE9-->
<!--<script src="http://github.com/janl/mustache.js/raw/master/mustache.js"></script>-->
<script src="http://ajax.cdnjs.com/ajax/libs/mustache.js/0.3.0/mustache.min.js"></script>

<script src="https://github.com/downloads/wycats/handlebars.js/handlebars.1.0.0.beta.3.js"></script>

<script src="http://cdn.kendostatic.com/2011.3.1007/js/kendo.all.min.js"></script>

<script src="http://jashkenas.github.com/coffee-script/extras/coffee-script.js"></script>

<!--NOTE: Need to load from MSFT CDN since GitHub uses text/plain MIME type, which is blocked in IE9-->
<!--<script src="http://github.com/jquery/jquery-tmpl/raw/master/jquery.tmpl.min.js"></script>-->
<script src="http://ajax.microsoft.com/ajax/jquery.templates/beta1/jquery.tmpl.min.js"></script>

<!--External Template Definitions-->
<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>
<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.myTemplate = compileTemplate("<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>");

  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>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
Mustache.js Template
Mustache.to_html(mustacheTemplate, sharedVariables);
pending…
jQuery Templates
jQueryTemplate($, {
 data: sharedVariables
}).join("");
pending…
Kendo UI Templates (Default)
kendouiTemplate(sharedVariables);
pending…
Kendo UI Templates (No "with" block)
kendouiTemplate2(sharedVariables)
pending…
Kendo UI Templates (External Temp Def)
kendoUIAlt(sharedVariables);
pending…
Kendo UI Templates (External Temp Def - No "with" block))
kendoUIAlt2(sharedVariables);
pending…
Handlebars.js
handlebarsTemplate(sharedVariables);
pending…
Underscore.js Template
underscoreTemplate(sharedVariables);
pending…
Resig Micro Templates (modified)
resig(sharedVariables)
pending…
Resig Micro Templates (No "with" block)
resig2(sharedVariables)
pending…
MyTemplate
myTemplate(sharedVariables)
pending…

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