Why do you NOT need to use new keyword when instantiating another indicator?

[lel4866]

IN your NinjaScript Best Practices, you have an example where you create and save a reference to EMA(20) in the OnStateChange() method:

private EMA myEMA;
private Series<double> mySeries;
private SessionIterator mySessionIterator;
 
protected override void OnStateChange()
{  
   if (State == State.DataLoaded)
   {
      myEMA = EMA(20);
      mySeries = new Series<double>(this);
      mySessionIterator = new SessionIterator(Bars);
   }
}

Why don't you need to say:

myEMA = new EMA(20);

instead of:

myEMA = EMA(20);

[lel4866]

I think I just answered my own question...the NinjaScript generated code for EMA defines an EMA function which does the new if the EMA(20) hasn't already been cached by something else:

return CacheIndicator<EMA>(new EMA(){ ...

[NinjaTrader_ChelseaB]

Hello lel4866,

You are correct. This is for caching purposes and NinjaTrader will construct the indicator and series using internal methods.