Michael Van Canneyt <mich...@freepascal.org> schrieb am Fr., 25. Mai 2018,
10:15:
>
>
> On Fri, 25 May 2018, Sven Barth via fpc-pascal wrote:
>
> > Yes, that is what it does. Though a possible optimization would be that
> the
> > compiler detects "dynarr := dynarr + [elem]" and converts it to
> > "Insert(elem, dynarr, High(dynarr))".
> >
> >
> >> Since dynamic array helpers work could you expose a function that adds
> an
> >> element to the array (an grows it if needed) so we could make helpers
> for
> >> it? Pushing a value to an array is perhaps the most common function used
> >> for lists so it makes sense to get that right imo.
> >>
> >
> > That function already exists and is called Insert() (see above).
>
> Nice. I didn't know Insert() could be used to append to the end of a
> string.
>
> One learns every day ! One for the documentation :-)
>
> To be clear: for strings you can do
>
> var
> S : String;
>
> begin
> S:='123';
> Insert('456',S,Length(S)+2);
> Writeln(S);
> end.
>
> and it will append. Is the same true for dynamic arrays ?
> i.e. any insert position >= length will do an append ?
>
Correct :)
Similar for indices <= 0: they will always prepend (for strings <= 1 of
course).
Regards,
Sven
>
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