Re^2: passing reference to subroutine

undef @struct; (better written as @struct = (); btw)

Not if the goal is to free up space rather than just empty it for reuse:

@a = 1..1e6;;
print total_size \@a;;
32000176

@a = ();;
print total_size \@a;;
8000176

undef @a;;
print total_size \@a;;
176
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