How to add int+int while an int is array?

You can do percentage selection WAY easier than building an array like that

int GetNumberOfItems() {
    const float PercentRoll = FMath::FRand();
    int NumberOfItems = 5;
    if (PercentRoll <= 0.30f) { NumberOfItems = 3; }
    else if (PercentRoll <= 0.70) { NumberOfItems = 4; }
    return NumberOfItems;
}

of course, it’ll take a few more lines to make it work with your datatable, but that’s the basics to doing a percent roll for selection.

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