ahh, I understand now, the IslandsGrid index which is set, will be by array rules and not if it was some map of index numbers to their values 
. Thanks for the explanation, I’m a real n00b 
only know JS/Python but decided to try this new syntax here and see what it does, imagined to myself that the index numbers will be keys in a map 
despite knowing I try to make an array, so silly.
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