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copied!<pre><code>main() { print('Hello, Dart!'); } </code></pre> <p>When compiled with dart2js <strong>(as of 2013-04-26)</strong> (see note at bottom) it is converted into:</p> <pre><code>// Generated by dart2js, the Dart to JavaScript compiler. // The code supports the following hooks: // dartPrint(message) - if this function is defined it is called // instead of the Dart [print] method. // dartMainRunner(main) - if this function is defined, the Dart [main] // method will not be invoked directly. // Instead, a closure that will invoke [main] is // passed to [dartMainRunner]. function Isolate() {} init(); var $ = Isolate.$isolateProperties; // Bound closures $.Primitives_printString = function(string) { if (typeof dartPrint == "function") { dartPrint(string); return; } if (typeof window == "object") { if (typeof console == "object") console.log(string); return; } if (typeof print == "function") { print(string); return; } throw "Unable to print message: " + String(string); }; $.main = function() { $.Primitives_printString("Hello, Dart!"); }; $.String = {builtin$cls: "String"}; var $ = null; Isolate = Isolate.$finishIsolateConstructor(Isolate); var $ = new Isolate(); // BEGIN invoke [main]. if (typeof document !== "undefined" && document.readyState !== "complete") { document.addEventListener("readystatechange", function () { if (document.readyState == "complete") { if (typeof dartMainRunner === "function") { dartMainRunner(function() { $.main(); }); } else { $.main(); } } }, false); } else { if (typeof dartMainRunner === "function") { dartMainRunner(function() { $.main(); }); } else { $.main(); } } // END invoke [main]. function init() { Isolate.$isolateProperties = {}; Isolate.$finishIsolateConstructor = function(oldIsolate) { var isolateProperties = oldIsolate.$isolateProperties; isolateProperties.$currentScript = typeof document == "object" ? document.currentScript || document.scripts[document.scripts.length - 1] : null; var isolatePrototype = oldIsolate.prototype; var str = "{\n"; str += "var properties = Isolate.$isolateProperties;\n"; var hasOwnProperty = Object.prototype.hasOwnProperty; for (var staticName in isolateProperties) { if (hasOwnProperty.call(isolateProperties, staticName)) { str += "this." + staticName + "= properties." + staticName + ";\n"; } } str += "}\n"; var newIsolate = new Function(str); newIsolate.prototype = isolatePrototype; isolatePrototype.constructor = newIsolate; newIsolate.$isolateProperties = isolateProperties; return newIsolate; }; } //@ sourceMappingURL=out.js.map </code></pre> <p><strong>Note for posterity:</strong> The original answer to this question has been modified to reflect the current state of affairs.</p> <p>On 2012-05-12 the dart output for Hello World was 18,718 characters.</p> <p>On 2012-08-29 the output was 1531 characters.</p> <p>On 2013-04-26, the output was 2642 characters.</p> <p>dart2js can minify code. Here is an example (as of 2013-04-26)</p> <pre><code>// Generated by dart2js, the Dart to JavaScript compiler. function I(){} init() var $=I.p $.ib=function(a){if(typeof dartPrint=="function"){dartPrint(a) return}if(typeof window=="object"){if(typeof console=="object")console.log(a) return}if(typeof print=="function"){print(a) return}throw "Unable to print message: " + String(a)} $.E2=function(){$.ib("Hello, Dart!")} $.qU={builtin$cls:"qU"} var $=null I = I.$finishIsolateConstructor(I) var $=new I() if (typeof document !== "undefined" && document.readyState !== "complete") { document.addEventListener("readystatechange", function () { if (document.readyState == "complete") { if (typeof dartMainRunner === "function") { dartMainRunner(function() { $.E2(); }); } else { $.E2(); } } }, false); } else { if (typeof dartMainRunner === "function") { dartMainRunner(function() { $.E2(); }); } else { $.E2(); } } function init(){I.p={} I.$finishIsolateConstructor=function(a){var z=a.p z.$currentScript=typeof document=="object"?document.currentScript||document.scripts[document.scripts.length-1]:null var y=a.prototype var x="{\n" x+="var properties = I.p;\n" var w=Object.prototype.hasOwnProperty for(var v in z){if(w.call(z,v)){x+="this."+v+"= properties."+v+";\n"}}x+="}\n" var u=new Function(x) u.prototype=y y.constructor=u u.p=z return u}}//@ sourceMappingURL=out.js.map </code></pre> <p>On 2013-04-26, the minified code was 1386 characters.</p>

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