Hello people, I have written a book on Ruby programming language.
Download it from here http://is.gd/r2012
On 08/22/2012 08:10 AM, Karthikeyan A k wrote:
Hello people, I have written a book on Ruby programming language.
Download it from here is.gd - Shortened URL
Thanks for sharing your work and esp. for the lovely “Math Discovery” at
p. 162
regards
ralf
On Wed, Aug 22, 2012 at 9:38 AM, Ralf M. [email protected]
wrote:
On 08/22/2012 08:10 AM, Karthikeyan A k wrote:
Hello people, I have written a book on Ruby programming language.
Download it from here is.gd - Shortened URLThanks for sharing your work and esp. for the lovely “Math Discovery” at p.
162
It is well known for a long time that you can prove anything if you
manage to sneak a division by zero into your proof. Various fun
proofs have been built around this. Note also that this has nothing
to do with how computers do math.
Kind regards
robert
Am 22.08.2012 08:10, schrieb Karthikeyan A k:
Hello people, I have written a book on Ruby programming language.
Download it from here is.gd - Shortened URL
Though appreciating the effort that was put into this,
I would not recommend this at the moment as a good starting
point for beginners. There is still a lot of work to be done.
I only browsed a couple of pages and I found:
-
a wrong algorithm (on p. 32)
finds the greatest of three numbers
a,b,c = 3,7,5
if a > b and a > c
puts “a = #{a} is greatest”
elsif b > c and b > a
puts “b = #{b} is greatest”
else puts “c = #{c} is greatest”
endNow try that with a,b,c = 4,4,3 !
=> c = 3 is greatest -
doubtful simplifications and half-truths:
“The p is a kind of short form for puts.” (p. 33)
“Note that if we use else with unless we must terminate
the unless block with an end command.” (p. 34) -
antipatterns (unless…else) (on p. 34):
unless age < 18 or age > 35
p “You can enter Armed forces”
else p “You cannot enter Army. You are either too young or too
old”
endThis highly confusing usage of unless finds its counterpart in
sentences like “Let say that one is not a major and is considered
a child unless he or she is less than 18 years old.”
(Which is wrong, by the way.) -
a programming style (indentations, …) that does not follow the
highly reasonable style widely established in the Ruby community
(see above examples)
On Wed, Aug 22, 2012 at 1:10 AM, Karthikeyan A k [email protected]
wrote:
Hello people, I have written a book on Ruby programming language.
Download it from here is.gd - Shortened URL
Thanks so much! I haven’t had time to look at most of it, but I notice
there are missing hyphens in some code sections, e.g. all of these on
p. 10:
$ sudo aptget install buildessential bison openssl libreadline6
libreadline6
dev curl gitcore zlib1g zlib1gdev libssldev libyamldev libsqlite30
libsqlite3dev sqlite3 libxml2dev libxsltdev autoconf libc6dev
ncursesdev
automake
and:
$ curl L https://get.rvm.io | bash s stable ruby
and:
$ echo '[[ s “$HOME/.rvm/scripts/rvm” ]] && . “$HOME/.rvm/scripts/rvm”
Load
RVM function’ >> ~/.bashrc
and:
$ ruby v
On 08/22/2012 10:19 AM, Robert K. wrote:
to do with how computers do math.
Sure, it hasn’t. You can proof everything out of something wrong, e.g.
my math teacher proofed that he is the
pope out of 1 = 2
Thanks for this book !
On 22 Αυγ 2012, at 09:10 , Karthikeyan A k [email protected] wrote:
Hello people, I have written a book on Ruby programming language.
Download it from here is.gd - Shortened URL
Hello,
Thanks for the effort and for supplying an entire book for free. Is it
possible to have .mobi and/or .epub versions?
Best Regards,
–
Posted via http://www.ruby-forum.com/.
Panagiotis A.
To avoid this problem, use this file
https://raw.github.com/mindaslab/ilrx/master/ruby_install.bash
Eric C. wrote in post #1073242:
On Wed, Aug 22, 2012 at 1:10 AM, Karthikeyan A k [email protected]
wrote:Hello people, I have written a book on Ruby programming language.
Download it from here is.gd - Shortened URLThanks so much! I haven’t had time to look at most of it, but I notice
there are missing hyphens in some code sections, e.g. all of these on
p. 10:$ sudo aptget install buildessential bison openssl libreadline6
libreadline6
…s/rvm" ]] && . “$HOME/.rvm/scripts/rvm”Load
RVM function’ >> ~/.bashrc
and:
$ ruby v
OK, fixed the bug on page 32, but others… I think that’s OK. Thanks,
spot more.
unknown wrote in post #1073171:
Am 22.08.2012 08:10, schrieb Karthikeyan A k:
Hello people, I have written a book on Ruby programming language.
Download it from here is.gd - Shortened URLThough appreciating the effort that was put into this,
…I only browsed a couple of pages and I found:
a wrong algorithm (on p. 32)
finds the greatest of three numbers
a,b,c = 3,7,5
…
else puts “c = #{c} is greatest”
endNow try that with a,b,c = 4,4,3 !
=> c = 3 is greatest
…
end
…