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comp.lang.ruby

Getting last character from a string

draco draco

2/12/2006 12:08:00 AM

Hello
I'm new to Ruby. I've a simple question.
Is there a more readable way to get last character from string than this
one? :

x = "text"
last_char = x[x.length-1, x.length-1]

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5 Answers

James Gray

2/12/2006 12:13:00 AM

0

On Feb 11, 2006, at 6:07 PM, draco draco wrote:

> Hello

Hello.

> I'm new to Ruby.

Welcome then.

> I've a simple question.
> Is there a more readable way to get last character from string than
> this
> one? :
>
> x = "text"
> last_char = x[x.length-1, x.length-1]

Strings can take a negative index, which count backwards from the end
of the String, and an length of how many characters you want (one in
this example). Using that:

"test"[-1, 1] # => "t"

Hope that helps.

James Edward Gray II

Tim Hunter

2/12/2006 12:15:00 AM

0

draco draco wrote:
> Hello
> I'm new to Ruby. I've a simple question.
> Is there a more readable way to get last character from string than this
> one? :
>
> x = "text"
> last_char = x[x.length-1, x.length-1]
>

last_char = x[-1,1]

A negative index counts from the right-hand end of the string.

Wilson Bilkovich

2/12/2006 12:17:00 AM

0

On 2/11/06, draco draco <thedraco@go2.pl> wrote:
> Hello
> I'm new to Ruby. I've a simple question.
> Is there a more readable way to get last character from string than this
> one? :
>
> x = "text"
> last_char = x[x.length-1, x.length-1]
>

You can do:
last_char = x[-1,1]
or # possibly too arcane
last_char = x.split('').last

The second has the advantage of being (I think) multibyte-character safe.

William James

2/12/2006 9:05:00 AM

0

draco draco wrote:
> Hello
> I'm new to Ruby. I've a simple question.
> Is there a more readable way to get last character from string than this
> one? :
>
> x = "text"
> last_char = x[x.length-1, x.length-1]

"abc"[ -1..-1 ]

"abc".slice(-1,1)

"abc".slice(-1).chr

"abc"[ /.$/ ]

"abc".reverse[0,1]

"abc".split('').pop

class String
def last
self[-1,1]
end
end

"abc".last

draco draco

2/12/2006 9:35:00 AM

0

Wow :)

x[-1,1] looks far more readable than x[x.length-1, x.length-1]

Thanks a lot :)


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