Javascript: after(len) - counter used for async iteration

gistfile1

/*
  Counter used for async calls
  
  Example:
    var files = ['a', 'b'];
    finished = after(files.length);
    
    finished() // false
    finished() // true
    
*/
var after = exports.after = function(length) {
  var left = length;
  return function() {
    return (--left <= 0);
  };
};

Consider this?

return (--left <= 0);

Ohh concise. I like it - I'll update now