From: Jagadeesh <mnjagadeesh@...>
Date: 2010-01-11T18:25:19+09:00
Subject: Re: Help

On Jan 11, 11:54 am, Jeff Peng <jeffp...@netzero.net> wrote:
> 在 2010-01-11一的 15:30 +0900，Jagadeesh写道：
>
> > Thanks Jeff. yes you are correct. But have a question
>
> Because ruby is a strongly typed language while perl isn't.
>
> In perl everything doesn't need to be pre-defined with specified type.
> for example, a hash:
>
> my %hash;
> push @{$hash{key1}},"abc";
>
> As you see above, though we didn't pre-define $hash{key1} as an
> anonymous array, but perl does that for us silently.
>
> But in ruby, you can't say:
>
> hash = Hash.new
> hash['key1'] << "abc"
>
> This will get an error.
> Instead we would say:
>
> hash=Hash.new do |h,k| h['k'] = [] end
> hash['key1'] << "abc"
>
> This will work because we have passed a block to Hash.new method, this
> block will set hash's every value to a seperate empty array []. After
> that the array filling ("<<" in ruby) can run.
>
> HTH.
>
> Jeff.

That answered me. Thanks for your time

Thanks