Hello all,
Need help.
See code below. The array arr2 has data to start with.
The first 2 puts show output - no problem - both the same as expected.
The last 2 puts - no output - nothing - nada.
Between the lines shown here there is no other code - this is exactly
what the actual code looks like.
puts " #{arr2}"
arr1 = arr2
puts " #{arr1}"
arr2.clear
puts " #{arr1}"
puts " #{arr2}"
--
Posted via http://www.ruby-forum.com/.
Both variables point to the same array.
If you want two arrays, you need to call #dup:
arr2 = arr1.dup
--
Avdi Grimm
On Jul 13, 2012 11:43 PM, "Mike Onofrietto" <lists@ruby-forum.com> wrote:
Hello all,
Need help.
See code below. The array arr2 has data to start with.
The first 2 puts show output - no problem - both the same as expected.The last 2 puts - no output - nothing - nada.
Between the lines shown here there is no other code - this is exactly
what the actual code looks like.puts " #{arr2}"
arr1 = arr2
puts " #{arr1}"arr2.clear
puts " #{arr1}"
puts " #{arr2}"--
Posted via http://www.ruby-forum.com/\.
Avdi,
Thanks. I'll look into it. To me they should be two separate objects so
I would not expect the two names to refer to the same array.
In the meantime a did a work-around.
I created an empty array "dummy" so
arr2=dummy INSTEAD of arr2.clear.
It worked very well - solved the problem.
Avdi Grimm wrote in post #1068667:
Both variables point to the same array.
If you want two arrays, you need to call #dup:
arr2 = arr1.dup
--
Avdi Grimm
http://avdi.org
--
Posted via http://www.ruby-forum.com/\.
Thanks. I'll look into it. To me they should be two separate objects so
I would not expect the two names to refer to the same array.
variables are not objects. variables are names given to references to objects. After var2=var1 you had this setup:
var1 --> +-----+
> obj |
var2 --> +-----+
On Jul 13, 2012, at 23:31 , Mike Onofrietto wrote:
Ryan Davis wrote in post #1068678:
Thanks. I'll look into it. To me they should be two separate objects so
I would not expect the two names to refer to the same array.variables are not objects. variables are names given to references to
objects. After var2=var1 you had this setup:var1 --> +-----+
> obj |
var2 --> +-----+
Ryan,
Thanks. So the assignment is actually a pointing/reference operation
rather than a copy operation.
As such the assigment caused me to lose all reference to the other array
object.
I came up with a work-around, and now my code works well.
Thanks again.
You don't need a "work-around", you need to learn the language 
As Avdi pointed out, your use case calls for the #dup method.
On Sat, Jul 14, 2012 at 10:31 AM, Mike Onofrietto <lists@ruby-forum.com> wrote:
I came up with a work-around, and now my code works well.
--
Hassan Schroeder ------------------------ hassan.schroeder@gmail.com
twitter: @hassan