File.open and each

Ruby
1

What’s the difference between:

open(‘file.txt’) {|fh| fh.each {|l| puts l}}

… and:

open(‘file.txt’).each {|l| puts l}

? The first example seems to be favoured in “Well Grounded Rubyist” but
I discovered I could call each directly on the File.open object as it’s
enumerable. Any advantages of one over the other?

gvim

2
3

On Tue, May 6, 2014 at 6:23 PM, gvim [email protected] wrote:

enumerable. Any advantages of one over the other?
Yes, you should always use the first form because that ensures the
file handle is closed properly - even in case of exceptions in the
block.

Even simpler is

File.foreach ‘file.txt’ do |line|
puts line
end

or if you prefer the other syntax

File.foreach(‘file.txt’) {|line| puts line}

For more details please see also
http://blog.rubybestpractices.com/posts/rklemme/001-Using_blocks_for_Robustness.html
http://blog.rubybestpractices.com/posts/rklemme/002_Writing_Block_Methods.html

Kind regards

robert