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
On Tue, May 6, 2014 at 9:23 AM, gvim <gvimrc@gmail.com> wrote:
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
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
On Tue, May 6, 2014 at 6:23 PM, gvim <gvimrc@gmail.com> wrote:
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?
--
[guy, jim].each {|him| remember.him do |as, often| as.you_can - without end}
http://blog.rubybestpractices.com/