From: Robert Dober <robert.dober@...>
Date: 2006-06-07T06:08:49+09:00
Subject: Re: Slicing arrays

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On 6/6/06, Paul D. Kraus <paul.kraus@gmail.com> wrote:
>
> if have a text file I am parsing. I am using split to break the line into
> an
> array.
> I want to then use splice to pick and choose the fields that I one.
>
> so for example i have a string.
> mystring =3D '1,2,3,4,5,6'
>
> then i want to get an array but I only want the 2 field and the last thre=
e
> fields.
> myarray =3D mystring.split(',').splice(1,3..5)


Honestly I do not know about a splice method for Arrays

here is a less elegant way

    m =3D mystring.split(',')
    m[1..1] + m[3..5]
or in case you want to specify your ranges in a string
   "1,3..5".split(",").map{|x| x.split("..")}.flatten.map{|x| m[x.to_i]}

or you write your own splice method

class Array
    def splice( *args )
        args.map{ |arg|
            case arg
                when Integer
                    arg
                when Range
                    arg.to_a
                else
                    raise TypeError, "blah #{arg} is not to our liking"
            end # case arg
        }.flatten.map{ |a| self[a] }
    end # def splice( *args )
end # class Array

well now I know one ;)
Hope that helps
Robert




--=20
Deux choses sont infinies : l'univers et la b=EAtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein

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