Everybody thanks for the explanation.

I have another problem.
On this :

def test_accessing_hashes_with_fetch
hash = { :one => "uno" }
assert_equal "uno", hash.fetch(:one)
assert_raise("Class: <IndexError> Message: <"key not found">
---Backtrace--- ./about_hashes.rb:27:in `fetch' ./about_hashes.rb:27:in
`test_accessing_hashes_with_fetch' ") do
hash.fetch(:doesnt_exist)
end

I get always a syntax error.

How to solve this one?

Roelof


Op woensdag 19 september 2012 05:29:59 UTC+2 schreef cming xu het volgende:
As far as i know, ruby use memory location to generate object's id,
normally any dynamic objects(runtime generate objects) will have different
object_id, for example "foo".object_id not equal with "foo".object_id. But,
any object like number, true, false ,nil and symbol all have fixed object_id

--
rubyonrailsx
Sent with Sparrow <http://www.sparrowmailapp.com/?sig>

On Wednesday, September 19, 2012 at 1:23 AM, roelof wrote:

Hello,

Im trying to learn ruby by using koans.

Now I have to fill in this part.

def test_some_system_objects_always_have_the_same_id
assert_equal --, false.object_id
assert_equal --, true.object_id
assert_equal --, nil.object_id
end

According to the answers I have to fill in like this :

def test_some_system_objects_always_have_the_same_id
assert_equal 0, false.object_id
assert_equal 2, true.object_id
assert_equal 4, nil.object_id
end

But how can I normally know the id of a object ?

Roelof

--
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to rubyonra...@googlegroups.com<javascript:>
.
To unsubscribe from this group, send email to
rubyonrails-ta...@googlegroups.com <javascript:>.
To view this discussion on the web visit
https://groups.google.com/d/msg/rubyonrails-talk/-/ym3Iw2DuGgcJ.
For more options, visit https://groups.google.com/groups/opt_out.



--
You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group.
To post to this group, send email to rubyonrails-talk@googlegroups.com.
To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msg/rubyonrails-talk/-/k_QtwKnd7sIJ.
For more options, visit https://groups.google.com/groups/opt_out.

Search Discussions

Discussion Posts

Previous

Follow ups

Related Discussions

Discussion Navigation
viewthread | post
posts ‹ prev | 5 of 6 | next ›
Discussion Overview
grouprubyonrails-talk @
categoriesrubyonrails
postedSep 18, '12 at 5:23p
activeSep 19, '12 at 7:33a
posts6
users5
websiterubyonrails.org
irc#RubyOnRails

People

Translate

site design / logo © 2022 Grokbase