Silly example to add numbers to 5, after processing, beautified (ugly artifacts left in intentionally because, well, idc)

gistfile1.js

var yielding = false;
function this_makeFive(n){
  var step = 1;
  var v1, v0;
  var f1, f0;
  return function(){
    while (true) {
      switch (step) {
        case 1:
          if (n === 3);
          else { step = 3; continue; }
        case 2: step = 2;
        case 5: step = 5;
          v0 = (f0 = f0 || this_addOne(n))();
          if (yielding) return;
        case 6: step = 6;
          return v0+1;
          step = 4;
          continue;
        case 3: step = 3;
          if (n === 1);
          else { step = 8; continue; }
        case 7: step = 7;
        case 10: step = 10;
          v1 = (f1 = f1 || this_addThree(n))();
          if (yielding) return;
        case 11: step = 11;
          return v1+1;
          step = 9;
          continue;
        case 8: step = 8;
          throw 'invalid input, can only hand 1 and 3';
        case 9: step = 9;
        case 4: step = 4;
          return;
      }
    }
  };
}

function this_addThree(n){
  var step = 1;
  var v0;
  var f0;
  return function(){
    while (true) {
      switch (step) {
        case 1:

        case 2: step = 2;
          v0 = (f0 = f0 || this_addOne(n))();
          if (yielding) return;
        case 3: step = 3;
          return v0 + 2;
          return;
      }
    }
  };
}

function this_addOne(n){
  var step = 1;
  return function(){
    while (true) {
      switch (step) {
        case 1:
          step = 2;
          return void (yielding = true);
        case 2:
          ;
          return n+1;
          return;
      }
    }
  };
}

function get(n, callback) {
  var f = this_makeFive(n);
  var tmp = f();
  if (yielding) {
    setTimeout(function again(){
      yielding = false;
      tmp = f();
      if (yielding) {
        setTimeout(again, 100);
      } else {
        callback(tmp);
      }
    }, 100);
  }
}

get(3, function(n){ console.log(3,':',n); });
get(1, function(n){ console.log(1,':',n); });