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comp.lang.ruby

How is this split method working?

Raj Singh

5/20/2008 12:04:00 AM

length = 20
text = ' This forum is connected to a mailing list that is read by
thousands of people.'


text.split[0..length]

I looked at the split api but can't understand how the above code is
working.
--
Posted via http://www.ruby-....
7 Answers

7stud --

5/20/2008 12:36:00 AM

0

Raj Singh wrote:
> length = 20
> text = ' This forum is connected to a mailing list that is read by
> thousands of people.'
>
>
> text.split[0..length]
>
> I looked at the split api but can't understand how the above code is
> working.

split() returns an array, and:

arr = [10, 20, 30, 40]
p arr

slice = arr[0..2]
p slice

--output:--
[10, 20, 30, 40]
[10, 20, 30]
--
Posted via http://www.ruby-....

dare ruby

5/20/2008 3:47:00 AM

0

Raj Singh wrote:
> length = 20
> text = ' This forum is connected to a mailing list that is read by
> thousands of people.'
>
>
> text.split[0..length]
>
> I looked at the split api but can't understand how the above code is
> working.

Its not specific how you want to split your string but may be

split_text = split('')

will split the string of characters like,

T
h
i
s

f
o
......


so samething like

split_text = split(' ')

withh split the string into an array of strings like

This
forum
is
connected
to
a
mailing
list
.....


so if you give your specifications clearly we are ready to help you Raj
singh..


--- Jose Martin
--
Posted via http://www.ruby-....

Peña, Botp

5/20/2008 4:20:00 AM

0

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dare ruby

5/20/2008 4:31:00 AM

0

Peña, Botp wrote:
> From: Raj Singh [mailto:neeraj.jsr@gmail.com]
> # length = 20
> # text = ' This forum is connected to a mailing list that is read by
> # thousands of people.'
> # text.split[0..length]
> # I looked at the split api but can't understand how the above code is
> # working.
>
> Hi Raj,
>
> u didn't show what you wanted.
>
> so (i guess :), maybe you want string#[] or string#slice instead,
>
> length=20
> #=> 20
>
> text = ' This forum is connected to a mailing list that is read by
> thousands of people'
> #=> " This forum is connected to a mailing list that is read by
> thousands of people"
>
> text[0,length]
> #=> " This forum is conne"
>
> text[0..length-1]
> #=> " This forum is conne"
>
> text[length..-1]
> #=> "cted to a mailing list that is read by thousands of people"
>
> kind regards -botp


yes i agree with your comments.

raj you did not specified what you need clearly but hope the above would
help you a lot in your work.

this is the thing you expected?

ready to do it for you but need specifications clearly.

-- jose martin

--
Posted via http://www.ruby-....

Raj Singh

5/20/2008 5:34:00 AM

0

if you look at the comments of this blog
http://daniel.collectiveidea.com/blog/2007/7/10/a-prettier-trunc...
you will find following code.


def truncate_words(text, length = 10, separator = ' ', truncate_string =
'...')
' ' if text.nil?

truncated_text = text.split[0..length].join(separator)

if(truncated_text == text)
text
else
truncated_text + ' ' + truncate_string
end
end


I had never seen text.split[0..length] before. What's happening here. I
always saw split being passed an argument but never an array.
--
Posted via http://www.ruby-....

Peña, Botp

5/20/2008 6:52:00 AM

0

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7stud --

5/20/2008 6:07:00 PM

0

Raj Singh wrote:
> I had never seen text.split[0..length] before. What's happening here. I
> always saw split being passed an argument but never an array.

The code you originally posted:

>result = text.split[0..length]

is equivalent to:

arr = text.split
result = arr[0..length]
--
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