Array question

ruby-talk
1

Hi,
I have a csv file. #several really
That file is fed to the @points variable (see below) when creating an instance of the class.
I'd like b[5] to hold an array of all remaining records in the file left on that line.
Now it just pushes the 5th record. I can add b[6] which will get the next record. But The number of records left vary....

I am building my app slowly. i'd like to be able to get the same functionality somewhere in the middle also.
as i have 3 fixed variables in my Acupunt class and 2that can have more than 1 value. I am guessing i have to look at a new approach here.

···

----------------------------------------------
def set_punten
   @punten=[]
   File.open("#{@points}", "r").each {|e|
     e.chomp!
     b=e.split(";")
     @punten.push(Acupunt.new(b[0],b[1],b[2],b[3],b[4],b[5]))
   }
end
-----------------------
any suggestions?

Eelco

2

You can do something like this:

def test(*args) #gather all the args into an array
  p args
end

arr = [10, 20, 30, 40, 50]

single_args = 3
args_for_def = []

single_args.times do
   args_for_def << arr.shift
end
args_for_def << arr

test(*args_for_def) #split args_for_def into individual elements

--output:--
[10, 20, 30, [40, 50]]

···

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

3

Hi,
I have a csv file. #several really
That file is fed to the @points variable (see below) when creating an
instance of the class.
I'd like b[5] to hold an array of all remaining records in the file left
on that line.
Now it just pushes the 5th record. I can add b[6] which will get the
next record. But The number of records left vary....

I am building my app slowly. i'd like to be able to get the same
functionality somewhere in the middle also.
as i have 3 fixed variables in my Acupunt class and 2that can have more
than 1 value. I am guessing i have to look at a new approach here.
----------------------------------------------
def set_punten
    @punten=
    File.open("#{@points}", "r").each {|e|

The string interpolation is pointless here. If @points may be anything you can do @points.to_s which is still more efficient in case it is actually a String.

Btw, you do not close the file handle properly! It's easier doing

File.foreach @points do |e|
...
end

      e.chomp!
      b=e.split(";")
      @punten.push(Acupunt.new(b[0],b[1],b[2],b[3],b[4],b[5]))

@punten.push(Acupunt.new(b[0],b[1],b[2],b[3],b[4],b[5..-1]))

    }
end
-----------------------
any suggestions?

You could also use CSV class from standard library to get rid of the need for parsing. See "ri CSV", e.g.

CSV.foreach(@points, :col_sep => ';') do |b|
   ...
end

Kind regards

  robert

···

On 11.03.2011 23:17, Catsquotl wrote:

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/