gistfile1.txt

$ cat plus.dart 
main() {
  var count = 0;
  for (var i = 0; i < 100000; i++) {
    count += i;
  }
  print(count);
}
$ time dart_release plus.dart 
4999950000

real	0m0.119s
user	0m0.088s
sys	0m0.028s
$ frogsh --compile-only --out=plus.js plus.dart
$ time node plus.js
4999950000

real	0m0.067s
user	0m0.060s
sys	0m0.004s
$ cat plus.js
//  ********** Library dart:core **************
//  ********** Natives dart:core **************
// ********** Code for Object **************
// ********** Code for BadNumberFormatException **************
function BadNumberFormatException() {}
BadNumberFormatException.prototype.toString = function() {
  return ("BadNumberFormatException: '" + this._s + "'");
}
// ********** Code for top level **************
function print(obj) {
  if (typeof console == 'object') {
    if (obj) obj = obj.toString();
    console.log(obj);
  } else {
    write(obj);
    write('\n');
  }
}
//  ********** Library dart:coreimpl **************
// ********** Code for NumImplementation **************
NumImplementation = Number;
// ********** Code for StringImplementation **************
StringImplementation = String;
StringImplementation.prototype.contains = function(pattern, startIndex) {
  return this.indexOf(pattern, startIndex) >= 0;
}
// ********** Code for top level **************
//  ********** Library plus **************
// ********** Code for top level **************
function main() {
  var count = 0;
  for (var i = 0;
   i < 100000; i = i + 1) {
    count = count + i;
  }
  print(count);
}
main();
$