Doing
arr = [1, [2, [3, 4], 5], 6]
arr.join(',')
in Ruby 1.8.6 produces the following string:
1,2,3,4,5,6
Looking at the docs (e.g. http://www.noobkit.com/ruby-array-join),
Array.join should work as following:
"Returns a string created by converting each element of the array to a
string, separated by sep."
Doing the following:
arr.each do |e|
puts e.to_s
end
produces:
1
2345
6
Thus, arr.join(',') should be:
1, 2345, 6
Am I missing something? How can I do the above?
Here's the most straightforward way:
arr = [1, [2, [3, 4], 5], 6]
a = ""
arr.each {|i| a << i.to_s << ","}
a.chop!
martin
On 6/29/07, freeunli@yahoo.com <freeunli@yahoo.com> wrote:
Thus, arr.join(',') should be:
1, 2345, 6
Am I missing something? How can I do the above?
Martin, thanks! Should the behavior of "join" be like this or the docs
are wrong?
Very surprised about this behavior, IMHO it is wrong, at least it is
inconsistent :
irb(main):007:0> a=[1,[2,[3,4],5],6]
=> [1, [2, [3, 4], 5], 6]
irb(main):008:0> a.join(",")
=> "1,2,3,4,5,6"
irb(main):009:0> b=[1,{2=>42},{3=>[4,5]}]
=> [1, {2=>42}, {3=>[4, 5]}]
irb(main):010:0> b.join(",")
=> "1,242,345"
Robert
On 6/28/07, fu <freeunli@yahoo.com> wrote:
Martin, thanks! Should the behavior of "join" be like this or the docs
are wrong?
--
I always knew that one day Smalltalk would replace Java.
I just didn't know it would be called Ruby
-- Kent Back
Have you look at how Array#to_s is described as returning Array#join (the only difference being that to_s doesn't accept an argument and the default value of the separator is $,)?
irb(main):001:0> a = [1,[2,[3,4],5],6]
=> [1, [2, [3, 4], 5], 6]
irb(main):002:0> a.to_s
=> "123456"
irb(main):003:0> a.join(',')
=> "1,2,3,4,5,6"
irb(main):004:0> $, = '-'
=> "-"
irb(main):005:0> a.to_s
=> "1-2-3-4-5-6"
irb(main):006:0> a.join
=> "1-2-3-4-5-6"
irb(main):007:0> a.join(',')
=> "1,2,3,4,5,6"
Hmm, what about that one with the hash for an element? (Remember, $, is still redefined to '-')
irb(main):008:0> b=[1,{2=>42},{3=>[4,5]}]
=> [1, {2=>42}, {3=>[4, 5]}]
irb(main):009:0> b.to_s
=> "1-2-42-3-4-5"
irb(main):010:0> b.join(',')
=> "1,2-42,3-4-5"
Hash#to_s first converts to an array of [key,value] pairs and then converts that to a string using Array#join with the default separator.
It seems that the use of "default" here, means the $, from Array#join(separator=$,), not the argument given to b.join
OK, one more:
irb(main):011:0> b.last[4]=6
=> 6
irb(main):012:0> b
=> [1, {2=>42}, {3=>[4, 5], 4=>6}]
irb(main):013:0> b.join(',')
=> "1,2-42,3-4-5-4-6"
Possibly unexpected, but I don't see it as inconsistent.
-Rob
Rob Biedenharn http://agileconsultingllc.com
Rob@AgileConsultingLLC.com
On Jun 28, 2007, at 4:29 PM, Robert Dober wrote:
On 6/28/07, fu <freeunli@yahoo.com> wrote:
Martin, thanks! Should the behavior of "join" be like this or the docs
are wrong?Very surprised about this behavior, IMHO it is wrong, at least it is
inconsistent :irb(main):007:0> a=[1,[2,[3,4],5],6]
=> [1, [2, [3, 4], 5], 6]
irb(main):008:0> a.join(",")
=> "1,2,3,4,5,6"
irb(main):009:0> b=[1,{2=>42},{3=>[4,5]}]
=> [1, {2=>42}, {3=>[4, 5]}]
irb(main):010:0> b.join(",")
=> "1,242,345"Robert
--
I always knew that one day Smalltalk would replace Java.
I just didn't know it would be called Ruby
-- Kent Back
I always knew that one day Smalltalk would replace Java.
I just didn't know it would be called Ruby
-- Kent Back
It's Kent Beck, isn't it?
Cool quote btw.
> I always knew that one day Smalltalk would replace Java.
> I just didn't know it would be called Ruby
> -- Kent BackIt's Kent Beck, isn't it?
Cool quote btw.
--
Giles BowkettBlog: http://gilesbowkett.blogspot.com
Portfolio: http://www.gilesgoatboy.org
It's Kent, AFAIR Rick got confirmation from Kent himself.
I recently attributed it to Alain Kay, Rick shook a friendly
forefinger at me and I felt so bad to decide to change my sig. I have
seen it before on this list though 
BTW Giles I do not remember any mention of the $, change in the doc,
but agreed that would make it consistent, it is therefore a good way
to look at that behavior without too much surprise.
Cheers
R.
-
> > I always knew that one day Smalltalk would replace Java.
> > I just didn't know it would be called Ruby
> > -- Kent Back
>
> It's Kent Beck, isn't it?
>
> Cool quote btw.
It's Kent, AFAIR Rick got confirmation from Kent himself.
Sorry, no, I mean Beck not Back.
I recently attributed it to Alain Kay, Rick shook a friendly
forefinger at me and I felt so bad to decide to change my sig. I have
seen it before on this list though
Definitely an awesome quote.
BTW Giles I do not remember any mention of the $, change in the doc,
but agreed that would make it consistent, it is therefore a good way
to look at that behavior without too much surprise.
Hmm. I don't remember saying what you're agreeing with me about, but
hey, obviously I must have been right.
> > > I always knew that one day Smalltalk would replace Java.
> > > I just didn't know it would be called Ruby
> > > -- Kent Back
> >
> > It's Kent Beck, isn't it?
> >
> > Cool quote btw.> It's Kent, AFAIR Rick got confirmation from Kent himself.
Sorry, no, I mean Beck not Back.
I hereby declare myself an Agghead!!!!
Thx Giles, quote corrected, I can only hope that Kent is *not* reading
this list!!!
Hmm. I don't remember saying what you're agreeing with me about, but
hey, obviously I must have been right.
Quite obviously
On 6/29/07, Giles Bowkett <gilesb@gmail.com> wrote:
--
I always knew that one day Smalltalk would replace Java.
I just didn't know it would be called Ruby
-- Kent Beck