File.each can start from bottom of file?

[Roger]

Instead of iterating from first to last line in file,
can the each method go from last to first?

If no, any ideas to achieve this?

Thanks,
Roger

 

[Dave Burt]

Instead of iterating from first to last line in file,
can the each method go from last to first?

If no, any ideas to achieve this?

If your file isn't huge, use IO.readlines(filename).reverse.each

Cheers,
Dave

 

[Daniel Berger]

If your file isn't huge, use IO.readlines(filename).reverse.each

If using IO.readlines isn't viable due to file size, take a look at
this old thread:

http://tinyurl.com/qh4a5

Regards,

Dan

 

[Dave Burt]

If using IO.readlines isn't viable due to file size, take a look at
this old thread:

http://tinyurl.com/qh4a5

Regards,

Dan

Also, there's this more recent implementation by JEGII:

http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/177347

Cheers,
Dave

 

[Robert Klemme]

If your file isn't huge, use IO.readlines(filename).reverse.each

For efficiency reasons you can iterate in reverse without creating the
reversed array first:

IO.readlines(filename).reverse_each

And it is exactly the same amount of character typing.

Kind regards

robert