automate tuple creation

[forkit]

On Friday, 21 January 2022 at 02:30:35 UTC, Ali Çehreli wrote:
>
> The bigger question is, why did 'formattedRecords' exist at 
> all? You could have written the output directly to the file.

Oh. this was intentional, as I wanted to write once, and only 
once, to the file.

The consequence of that decision of course, is the extra memory 
allocations...

But in my example code I only create 10 records. In reality, my 
dataset will have 100,000's of records, so I don't want to write 
100,000s of time to the same file.

> But even *worse* and with apologies, ;) here is something crazy 
> that achieves the same thing:
>
> void ProcessRecords
> (in int[][int][] recArray, const(string) fname)
> {
>     import std.algorithm : joiner;
>     auto toWrite = recArray.map!(e => e.byPair);
>     File("rnd_records.txt", 
> "w").writefln!"%(%(%(%s,%(%s,%)%)%)\n%)"(toWrite);
> }
>
> I've done lot's of trial and error for the required number of 
> nested %( %) pairs. Phew...
>
> Ali

Yes, that does look worse ;-)

But I'm looking into that code to see if I can salvage something 
from it ;-)