fully transparent closure-wrapping of loop bodies, showcasing all features

coffee

fns = []
for k, v of obj
  continue if k is 0
  break if k is 1
  fns.push (a) ->
    console.log k, v
    return k
  return k if k is 2

js

var fns, k, v, __fn, __result;
var __return={}, __break={};
fns = [];
__fn = function(arguments, k, v) {
  if (k === 0) return;
  if (k === 1) return [__break];
  fns.push(function(a) {
    console.log(k, v);
    return k;
  });
  if (k === 2) return [__return, k];
};
for (k in obj) {
  __result = __fn.call(this, arguments, k, obj[k]);
  if(!__result) continue;
  if(__result[0] === __return) return __result[1];
  if(__result[0] === __break) break;
}