MTF Best Practice?

[MXASJ]

Hi Ninja Team,

Is there a best practice for using BarsInProgress vs. BarsArray in a Strategy? For example, what is the difference between this:

[COLOR=blue]if[/COLOR] (EMA(BarsArray[0], eMAFastLength)[0] > EMA(BarsArray[0], eMASlowLength)[0]) baseTFLongOK = [COLOR=blue]true[/COLOR];
[COLOR=blue]else[/COLOR] baseTFLongOK   = [COLOR=blue]false[/COLOR];
 
[COLOR=blue]if[/COLOR] (EMA(BarsArray[0], eMAFastLength)[0] < EMA(BarsArray[0], eMASlowLength)[0]) baseTFShortOK = [COLOR=blue]true[/COLOR];
[COLOR=blue]else[/COLOR] baseTFShortOK  = [COLOR=blue]false[/COLOR];

and this:

[COLOR=blue]if[/COLOR] (BarsInProgress == 0)
            {
                [COLOR=blue]if[/COLOR] (EMA(eMAFastLength)[0] > EMA(eMASlowLength)[0]) baseTFLongOK = [COLOR=blue]true[/COLOR];
                [COLOR=blue]else[/COLOR] baseTFLongOK = [COLOR=blue]false[/COLOR];
 
                [COLOR=blue]if[/COLOR] (EMA(eMAFastLength)[0] < EMA(eMASlowLength)[0]) baseTFShortOK = [COLOR=blue]true[/COLOR];
                [COLOR=blue]else[/COLOR] baseTFShortOK = [COLOR=blue]false[/COLOR];
            }

Is there a use case scenario where one is prefered over the other?

Thanks.

[NinjaTrader_Bertrand]

MXASJ, BarsInProgress is used to check with Bars object calls the OnBarUpdate(), while BarsArray just give you access to the dataseries values of the added objects (without an event based focus / context).