Re: Re: (Efficiency Golf) Triangular numbers

[blakem]

I'm familiar with assigning to slices of a hash, and its use in this line:

@seen {$t, $h, $r, $e} = ();

was very clever. However, why did you use slices in these lines?

@seen {$n,} = ();
....
@seen {$o,} = ();

Aren't they equivalent to:

$seen{$n} = undef;
$seen{$o} = undef;

Or even just:

@seen {$n} = ();  # note the lack of comma after $n
....
@seen {$o} = ();

I guess its that trailing comma that looks odd to me.

-Blake
p.s. props on the @HIGH and @LOW generation... very sneaky!

[Abigail]

I used @seen {$n,} = (); and not $seen {$n} = undef; because I used the slice in the other case as well. I wanted to use as much identical syntax as possible, and didn't see a reason to special case adding a single key.

As for using a trailing comma, all I can say is that using -w is useful. If you use it, you'll see why the comma was used.

-- Abigail