Newbie Q why doesn't this NEXT work

ruby-talk
1

the data: -17780 51697-62657 51697-62651 date: 2453507 << good data
error in data file:
-17737,147401-93780
147401-93780,147401-93780,12/28/2004
ruby code:
cppewq=[]
CSV.open("neat.txt","r") do |row|
   hh=row[3]
   h1=row[1]
   h2=row[2]
   h3=row[0]
   next if hh=nil || h1=nil || h2=nil || h3=nil
   g=ParseDate::parsedate(row[3])[0..2]
   j=Date.new(g[0],g[1],g[2])
   puts 'the data: '+"#{row[0].to_i.to_s}"+' '+row[1]+' '+row[2]+' date:
'+"#{j.jd.to_s}"
   cppewq<<[row[0].to_i,row[1],row[2],j] if j!=nil && row[1]!=nil &&
row[2]!=nil
end

TypeError: can't dup NilClass
        from c:/ruby182/lib/ruby/1.8/date/format.rb:236:in `dup'
        from c:/ruby182/lib/ruby/1.8/date/format.rb:236:in `_parse'
        from c:/ruby182/lib/ruby/1.8/ParseDate.rb:9:in `parsedate'
        from (irb):25
        from (irb):24:in `open_reader'
        from c:/ruby182/lib/ruby/1.8/csv.rb:311:in `parse'
        from c:/ruby182/lib/ruby/1.8/csv.rb:531:in `each'
        from c:/ruby182/lib/ruby/1.8/csv.rb:531:in `parse'
        from c:/ruby182/lib/ruby/1.8/csv.rb:311:in `open_reader'
        from c:/ruby182/lib/ruby/1.8/csv.rb:85:in `open'
        from (irb):24
        from (null):0

···

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2

dave rose <bitdoger2@yahoo.com> writes:

the data: -17780 51697-62657 51697-62651 date: 2453507 << good data
error in data file:
-17737,147401-93780
147401-93780,147401-93780,12/28/2004
ruby code:
cppewq=
CSV.open("neat.txt","r") do |row|
   hh=row[3]
   h1=row[1]
   h2=row[2]
   h3=row[0]
   next if hh=nil || h1=nil || h2=nil || h3=nil

Comparison is ==, not = in Ruby. Here you would assign nil.

Tom

3

dave rose wrote:
...

   g=ParseDate::parsedate(row[3])[0..2]

...

TypeError: can't dup NilClass

...

Looks like row[3] is nil.

I always like to display the actual objects/values when
developing/debugging to ensure that the state/data matches my
expectaions...

Cheers

···

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