From: Rimantas Liubertas <rimantas@...>
Date: 2009-09-18T15:13:05+09:00
Subject: Re: simple question: compare words

> I want to compare same words in a and b then,
> I wrote this,
>
> $ye
> $bu
> a = "ali", "bel", "del","en"
> b = "ali","bas","del","sx","en","sz","zen"
>
> for xa in a
>  $ye= xa
> end
> b.each do |bx|
>  $bu = bx
>    if $ye == $bu
>      puts "#{$ye} and #{$bu}"
>    end
> end
>
> result:
> => en and en
>
> but result is only "en and en". why the last one?
> where is the others ali and del???

You get only en, because by the end of this loop:

> for xa in a
>  $ye= xa
> end

you have the last item ("en") in a assigned to $ye and then continue
to compare this last value to the b.
No wonder it finds only "en".

In Ruby you can find common element in array with &:
>> a = %w{ali bel del en}
=> ["ali", "bel", "del", "en"]

>> b = %w{ali bas del sx en sz zen}
=> ["ali", "bas", "del", "sx", "en", "sz", "zen"]

>> a & b
=> ["ali", "del", "en"]

Regards,
Rimantas
--
http://rimantas.com/