On Tuesday, January 10, 2017 at 9:52:06 AM UTC+2, Chetan Gowda wrote:

Old data remains as it is in the existing allocation. It will be 
> overwritten as you fill up the slice again. 


This happens in case of group = group[:0],
OP asks what happens   in case of group = make( []Area, 0, MAX ),
In that case  old data will be garbage collected when GC runs.

Djadala  

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