Re: Addition of map() and filter().

[Steven Johnson <steve@...>]

On Mon, Oct 12, 2009 at 4:50 PM, André Ericsson <eandre@gmail.com> wrote:
>> I may have missed something while reading through this, but why not
>> use tables, like this?
>> function tostringall(...)
>>    local t={...}
>>    for k,v in ipairs(t)
>>       t[k]=tostring(v)
>>    end
>>    return unpack(t)
>> end
>
> I believe the reasoning against that was garbage creation concerns.
> The simple cases at the beginning of the function were added due to
> performance concerns.

There have been proposals now and then to add an apairs() iterator, which would
behave like ipairs(), but over its arguments instead of a table's
array part. A little
while back I mentioned one that I had written with minimal garbage in mind:

http://lua-users.org/lists/lua-l/2009-06/msg00358.html