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
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--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
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"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.
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