fastercsv and several row

[Li Chen]

Hi all,

I just try fastercsv and it works fine.

I use the codes below to print out the first columns of the first ten
rows. And it is OK. Question1) Is this the Ruby way to do that?
Question 2)what if I want to print out the first columns of row 20-30?


Thank you very much,

Li

####
i=1
FasterCSV.foreach('test.csv','rb') do |row|
puts row[0]
break if i==10
i+=1
end
####

 

[James Gray]

Hi all,
Hello.

I just try fastercsv and it works fine.
Great.

I use the codes below to print out the first columns of the first ten
rows. And it is OK. Question1) Is this the Ruby way to do that?

It's definitely one possible way. You could also use:

FCSV.open('test.csv') do |csv|
csv.each do |row|
puts row.first
break if csv.lineno >= 10
end
end

Question 2)what if I want to print out the first columns of row
20-30?

FCSV.open('test.csv') do |csv|
csv.each do |row|
puts row.first if csv.lineno >= 20
break if csv.lineno >= 30
end
end

Hope that gives you some fresh ideas.

James Edward Gray II

 

[Li Chen]

Hi James,

Thank you very much. But where can I find description about method
row.first and csv.lineno in the document?


Li

 

[James Gray]

Thank you very much. But where can I find description about method
row.first and csv.lineno in the document?

http://www.ruby-doc.org/core/classes/Array.html#M000275

http://fastercsv.rubyforge.org/classes/FasterCSV.html (look in the
Attributes section)

James Edward Gray II

 

[Li Chen]

http://www.ruby-doc.org/core/classes/Array.html#M000275

http://fastercsv.rubyforge.org/classes/FasterCSV.html (look in the
Attributes section)

James Edward Gray II

Thank you very much. They are really sweet.

Li