P vs. print

Ruby
21

On Fri, Sep 03, 2010 at 04:40:45AM +0900, Quintus wrote:

irb(main):003:0> print [1, 2, 3]
[1, 2, 3]=> nil

Are you sure about that? I get this:

irb(main):001:0> print [1, 2, 3]
123=> nil

The result you showed should probably be produced by:

print [1, 2, 3].inspect
22

Thanks @Brian for this nice clarification.

You mean here (inspect) right?

“Other classes inherit this from Object, although they can override it
if they wish.”

23

On Sep 4, 2010, at 12:02 PM, Chad P. wrote:

On Fri, Sep 03, 2010 at 04:40:45AM +0900, Quintus wrote:

irb(main):003:0> print [1, 2, 3]
[1, 2, 3]=> nil

Are you sure about that? I get this:

irb(main):001:0> print [1, 2, 3]
123=> nil

The result you showed should probably be produced by:

print [1, 2, 3].inspect

–
Chad P. [ original content licensed OWL: http://owl.apotheon.org ]

It all depends on what ruby you’re using:

$ rvm ruby -e ‘a=[1,2,3];puts “to_s”,a.to_s; puts “inspect”,a.inspect’
info: jruby-1.5.1: jruby 1.5.1 (ruby 1.8.7 patchlevel 249) (2010-06-06
f3a3480) (Java HotSpot™ Client VM 1.5.0_24) [i386-java]

Unable to find a $JAVA_HOME at “/usr”, continuing with system-provided
Java…
to_s
123
inspect
[1, 2, 3]

info: ree-1.8.7-head: ruby 1.8.7 (2009-06-12 patchlevel 174) [i686- darwin9.8.0]

to_s
123
inspect
[1, 2, 3]

info: ruby-1.8.6-p383: ruby 1.8.6 (2009-08-04 patchlevel 383) [i686- darwin9.8.0]

to_s
123
inspect
[1, 2, 3]

info: ruby-1.9.1-p378: ruby 1.9.1p378 (2010-01-10 revision 26273)
[i386-darwin9.8.0]

to_s
[1, 2, 3]
inspect
[1, 2, 3]

info: ruby-1.9.2-p0: ruby 1.9.2p0 (2010-08-18 revision 29036) [i386- darwin9.8.0]

to_s
[1, 2, 3]
inspect
[1, 2, 3]

So you might both be “right” on this.

-Rob

Rob B.
[email protected] http://AgileConsultingLLC.com/
[email protected] http://GaslightSoftware.com/

24

On Sat, Sep 4, 2010 at 11:02 AM, Chad P. [email protected] wrote:

On Fri, Sep 03, 2010 at 04:40:45AM +0900, Quintus wrote:

irb(main):003:0> print [1, 2, 3]
[1, 2, 3]=> nil

Are you sure about that? I get this:

irb(main):001:0> print [1, 2, 3]
123=> nil

The result you showed should probably be produced by:

print [1, 2, 3].inspect

–
Chad P. [ original content licensed OWL: http://owl.apotheon.org ]

Differences in versions. You can get an account at
http://ruby-versions.net/and play around like this

$ rvm ruby-1.8.6-p399,ruby-1.8.7-p174,ruby-1.9.1-p378,ruby-1.9.2-p0 -e
‘print [1,2,3]’

info: ruby-1.8.6-p399: ruby 1.8.6 (2010-02-05 patchlevel 399)
[x86_64-linux]

123
info: ruby-1.8.7-p174: ruby 1.8.7 (2009-06-12 patchlevel 174)
[x86_64-linux]

123
info: ruby-1.9.1-p378: ruby 1.9.1p378 (2010-01-10 revision 26273)
[x86_64-linux]

[1, 2, 3]
info: ruby-1.9.2-p0: ruby 1.9.2p0 (2010-08-18 revision 29036)
[x86_64-linux]

[1, 2, 3]

Going back further, it has been ‘123’ as far back as Ruby 1.0

$ ruby-1.0 -e ‘print [1,2,3]’
123