Instantiating A Class And Then Pass It To Setinterval

I've a crazy problem. I'm instantiating an object from a class. Then I want to pass a function from this object to the setInterval function. The whole code block is executed with a

Solution 1:

The workaround would be: wrap it using another function instead of calling method directly

functiondoKeyDown(e){
  var instance = newClass(e.keyCode);
  setInterval(function(){
    instance.functionToBeExecuded()
  }, 200);
}

This would give output many of these:

Class{functionToBeExecuded: function}