Silly example to add numbers to 5, before processing

gistfile1.js

var yielding = false;
function this_makeFive(n){
  if (n === 3) return this_addOne(n)+1;
  else if (n === 1) return this_addThree(n)+1;
  else throw 'invalid input, can only hand 1 and 3';
}

function this_addThree(n){
  return this_addOne(n) + 2;
}

function this_addOne(n){
  throwIfNotStreaming();
  return n+1;
}

function throwIfNotStreaming() {
  // this is where the parser prematurely reaches the EOF
  throw 'Unexpected EOF, cannot yield; not in streaming mode';
}

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); });