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comp.lang.ruby

What am I doing wrong! Arrays

Tj Superfly

6/30/2008 5:09:00 AM

title = "word word1 word2 word3 word4 word5 word6 word7 word8 word9
word10 word11 word12 word13"

array = title.split

if(array.length == "12")
puts array[0]
elsif(array.length == "13")
puts array[1].to_s + " " + array[2].to_s
elsif(array.length == "14")
puts array[1].to_s + " " + array[2].to_s + " " + array[3].to_s
end

My output should be "word1 word2" but I'm getting nothing.

What am I overlooking? I've tried everything I know, can anyone help?

Regards,

TJ
--
Posted via http://www.ruby-....
7 Answers

Daniel Sheppard

6/30/2008 5:12:00 AM

0

> title =3D "word word1 word2 word3 word4 word5 word6 word7 word8 =
word9
> word10 word11 word12 word13"
>=20
> array =3D title.split
>=20
> if(array.length =3D=3D "12")
> puts array[0]
> elsif(array.length =3D=3D "13")
> puts array[1].to_s + " " + array[2].to_s
> elsif(array.length =3D=3D "14")
> puts array[1].to_s + " " + array[2].to_s + " " + array[3].to_s
> end
>=20
> My output should be "word1 word2" but I'm getting nothing.
>=20
> What am I overlooking? I've tried everything I know, can anyone help?

12 =3D=3D "12" is going to be false.=20

Dan.

Tj Superfly

6/30/2008 5:15:00 AM

0

I thought of that too, but when I added the line:

twelve = "12" and then changed it to array.length == twelve it does the
same thing.

I'm still really confused at such a simple task. D:
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Posted via http://www.ruby-....

thomas peklak

6/30/2008 6:26:00 AM

0

Just do it this way and it should work:

if(array.length == 12)
puts array[0]
elsif(array.length == 13)
puts array[1].to_s + " " + array[2].to_s
elsif(array.length == 14)
puts array[1].to_s + " " + array[2].to_s + " " + array[3].to_s
end

Sebastian Hungerecker

6/30/2008 8:28:00 AM

0

Tj Superfly wrote:
> twelve = "12" and then changed it to array.length == twelve it does the
> same thing.

You're still compating array.length to "12", but Array#length returns
an integer, not a string. "12" is a string. array.length will return
12 and as Daniel said 12 == "12" is false. Whether you assign "12" to
a variable first or not.

HTH,
Sebastian
--
Jabber: sepp2k@jabber.org
ICQ: 205544826

krusty.ar@gmail.com

6/30/2008 12:17:00 PM

0

On Jun 30, 2:09 am, Tj Superfly <nonstickg...@verizon.net> wrote:
>   title = "word word1 word2 word3 word4 word5 word6 word7 word8 word9
> word10 word11 word12 word13"
>
>   array = title.split
>
>   if(array.length == "12")
>     puts array[0]
>   elsif(array.length == "13")
>     puts array[1].to_s + " " + array[2].to_s
>   elsif(array.length == "14")
>     puts array[1].to_s + " " + array[2].to_s + " " + array[3].to_s
>   end
>
> My output should be "word1 word2" but I'm getting nothing.
>
> What am I overlooking? I've tried everything I know, can anyone help?

The previous mails have nailed the problem, but your array length is
14, so the output should be "wiord1 word2 word3"


Lucas.

Florian Gilcher

6/30/2008 1:26:00 PM

0

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Are you a PHP programmer by trade?

That a typical PHP behaviour, because PHP casts Strings to Ints before
comparing. This can be confusing. (Although they sell it as "good
usability") Ruby does not know implicit casts and thus 11 != "11".
Ruby is not as lax as PHP when it comes to types.

(Fun fact. Did you know that 11 == "11abcde"? Ask PHP. Second FF: Did
you know that a variable containing 0 or "0" is empty()?)

Regards,
Florian Gilcher

On Jun 30, 2008, at 10:27 AM, Sebastian Hungerecker wrote:

> Tj Superfly wrote:
>> twelve = "12" and then changed it to array.length == twelve it does
>> the
>> same thing.
>
> You're still compating array.length to "12", but Array#length returns
> an integer, not a string. "12" is a string. array.length will return
> 12 and as Daniel said 12 == "12" is false. Whether you assign "12" to
> a variable first or not.
>
> HTH,
> Sebastian
> --
> Jabber: sepp2k@jabber.org
> ICQ: 205544826
>

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Dave Bass

6/30/2008 9:49:00 PM

0

Florian Gilcher wrote:
> That a typical PHP behaviour, because PHP casts Strings to Ints before
> comparing.

Similar thing with Perl. Perl scalars can be numbers or strings,
depending on the context. Sometimes you have to force them to be one or
the other; e.g. adding 0 to a scalar makes it more number-like;
appending an empty string "" makes it more string-like. But generally it
behaves in a sensible way.

Comparing a string to an integer is a typical gotcha for us ex-Perlers.

Dave
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