From: Simon Harrison <simon@...>
Date: 2011-01-14T05:19:47+09:00
Subject: Re: Retrieving and copying element from array

Thanks for reply, Anurag. Can't get this to work though:

irb(main):001:0> lines = File.readlines('test.txt')
=> ["category: cat1\n", " item1\n", " item2\n", " item3\n", "category: 
cat2\n", " item1\n", "category: cat3\n", " item1\n", " item2\n", " 
item3\n", " item4\n", "\n"]
irb(main):002:0> puts lines
category: cat1
 item1
 item2
 item3
category: cat2
 item1
category: cat3
 item1
 item2
 item3
 item4

=> nil
irb(main):003:0> result = []
=> []
irb(main):004:0> lines.each_slice(2) { |i, j| 
result.push(i.sub(/category: /, '')); b.push(*j.split(', '))}
NameError: undefined local variable or method `b' for main:Object
        from (irb):4:in `block in irb_binding'
        from (irb):4:in `each'
        from (irb):4:in `each_slice'
        from (irb):4
        from /usr/local/bin/irb:12:in `<main>'
irb(main):005:0> lines.each_slice(2) { |i, j| 
result.push(i.sub(/category: /, '')); j.push(*j.split(', '))}
NoMethodError: undefined method `push' for " item1\n":String
        from (irb):5:in `block in irb_binding'
        from (irb):5:in `each'
        from (irb):5:in `each_slice'
        from (irb):5
        from /usr/local/bin/irb:12:in `<main>'

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