From: Al Cholic <desertfox@...>
Date: 2007-07-28T09:08:52+09:00
Subject: Re: How to delete array element and add to previous element


> <code>
> raw_data = DATA.read
> data = []
> recd = nil
> raw_data.each do |line|
>     row = line.chomp.split("\t")
>     if row[0].empty?
>        recd[2] << row[2]
>     else
>        data << (recd = row)
>     end
> end
> p data
> </code>
> 
> Regards, Morton

Hi Morton,

Thank you very much for putting effort into this.  I was able to get it 
working, but could you explain how it works.  Here is the way I 
implemented:

def get_component_info(bom)       #gettting the bom array (each 
element=line)
  data = []                       #setting up a temp variable
  recd = nil
  bom.each do |line|              #starting to loop though each line
    row = line.chomp.split("\t")  #created new array row by splitting 
with tab
    if row[0].empty?
      recd[2] << row[2]
    else
      data << (recd = row)
    end
  end
data
end

Questions:
at this line:
if row[0].empty?

Why are you checking the first element of the array?  Would this always 
return false because there are no empty lines in the raw text file.

at this line:
recd[2] << row[2]

Does recd now become a an array?  And you are storing the third element 
of row in the third position of recd?  Why?

at this line:
data << (recd = row)

Is this the way to read it: assign row value to recd and store it in 
data?



I hope you can clarify these points.  It would be big help in 
understanding ruby better for me.

Thank you,

Chris

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