From: Sam Duncan <sduncan@...>
Date: 2012-06-07T12:06:52+09:00
Subject: Re: Parsing pipe delimited text file & storing in arrays

On 07/06/12 13:03, ideal one wrote:
> Hi,
>   I have a txt file with pipe delimited as show below.
>
> An example log file is: 
> test1|table1|chair1|55.00
> test2|table2|chair2|155.00
> test3|table3|chair3|55.50
> test1|table4|chair4|47.75
>
> i want to parse this txt file and my expected out should be
>
> (i) Total Cost of test1 = 55.00 + 47.75
> (ii) test1 possessed chair1 and chair4
>
> How do i achieve this in ruby code, i tried but doing it as array but
> how can i add up the price what 'test1' is responsible to pay?
>
> array = File.read("pipetest.txt").split(",").map(&:strip)
>
> puts array[1,2]
>
 > irb
1.9.3p125 :001 > foo = 
"test1|table1|chair1|55.00\ntest2|table2|chair2|155.00\ntest3|table3|chair3|55.50\ntest1|table4|chair4|47.75"
  => 
"test1|table1|chair1|55.00\ntest2|table2|chair2|155.00\ntest3|table3|chair3|55.50\ntest1|table4|chair4|47.75" 

1.9.3p125 :002 > tests = Hash.new { |h, k| h[k] = [] }
  => {}
1.9.3p125 :003 > foo.split("\n").each { |record| name, table, chair, 
price = record.split("|"); tests[name].push [chair, price] }
  => ["test1|table1|chair1|55.00", "test2|table2|chair2|155.00", 
"test3|table3|chair3|55.50", "test1|table4|chair4|47.75"]
1.9.3p125 :004 > tests.each_pair { |test, data| puts "(i) Total Cost of 
#{test} = " << (data.collect { |entry| entry.last }).join(" + "); puts 
"(ii) #{test} possessed " << (data.collect { |entry| entry.first 
}).join(" and ")  }
(i) Total Cost of test1 = 55.00 + 47.75
(ii) test1 possessed chair1 and chair4
(i) Total Cost of test2 = 155.00
(ii) test2 possessed chair2
(i) Total Cost of test3 = 55.50
(ii) test3 possessed chair3
  => {"test1"=>[["chair1", "55.00"], ["chair4", "47.75"]], 
"test2"=>[["chair2", "155.00"]], "test3"=>[["chair3", "55.50"]]}

That was a bit of fun. I'm sure you could do a better job of it if you 
spent a few more minutes =]

Sam