Hello,
How I can check if index is set
example: local!startchart[5]
if 5 in this array is not set throw 0 for example ?
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What I have used is: if(count(local!startchart) < 5,0,local!startchart[5]))
Far more flexible is the index() function. Basically what Stuart already answered below.
i.e. index(local!startChart, 5, 0)