Design with appender: good or bad?

[Chris]

On Thursday, 10 April 2014 at 14:16:02 UTC, Rene Zwanenburg wrote:
> On Thursday, 10 April 2014 at 13:57:26 UTC, Chris wrote:
>>
>> The funny thing, though, is that after clearing buf
>>
>> writeln(data1[0]);
>>
>> still prints "World1". It only changes after I add a new item 
>> to buf.
>
> Correct. The memory has not been touched by clear(), it just 
> sets it's internal used elements counter to 0. When adding new 
> items the old ones will be overwritten.

A source of subtle bugs. Good that I asked.