From: Randy Kramer <rhkramer@...>
Date: 2005-08-08T02:55:56+09:00
Subject: Re: cartesian product

On Sunday 07 August 2005 01:22 pm, Hal Fulton wrote:
> Haha... if it's this line you have trouble with
>
>    (c ||= []) << ae, be
>
> it's not that hard.
>
> The ||= is a well-known idiom -- same as c = c || []  here. Basically
> "assign c this value, unless it is already non-nil."
>
> So then you have either an existing array or an empty one.
> Then you can append (<<) onto it.

Hal,

Thanks--that line was the most confusing. (Yield I at least have a clue about, 
though I would need to think about it in this context a little more.)

regards,

Randy Kramer

>
> If it's the yield that bothers you, just study a bit more
> Ruby. Pascal was wonderful in 1980 -- unless you already knew
> something better -- but I'm content to let it go now. ;)
>
>
> Hal