SetLength() out of memory :(

[cronodragon]

for i := 0 to high(enemys) do
   if assigned(enemys[i]) then
     enemys[i].update(time_);

Instead I would do something like:

for i := 0 to lastIndex do
   enemys[i].update(time_);

Where lastIndex is not necessarily equal to high(enemys), just points to the last assigned element and the array can have any given size.

[dmantione]

One question...
Or does this advance you are talking about only make sense when the arrays size changes over and over again.... hundreds of times a second?

In my case the arrays size would only change e.g. if an enemy is destroyed.

Only when the array size changes over and over again. Using setlength once to initialize an array is not harmfull, since that compares to a simple "getmem".

However, changing the array size when an enemy is destroyed can be harmfull and cause heap fragmentation, be it slowly.