You can create an array with a range using splat,
>> a=*(1..10)=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
using Kernel Array method,
Kernel
Array
Array (1..10)=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
or using to_a
(1..10).to_a=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
This works for me in irb:
irb> (1..4).to_a=> [1, 2, 3, 4]
I notice that:
irb> 1..4.to_a(irb):1: warning: default `to_a' will be obsoleteArgumentError: bad value for range from (irb):1
So perhaps you are missing the parentheses?
(I am running Ruby 1.8.6 patchlevel 114)
Sounds like you're doing this:
0..10.to_a
The warning is from Fixnum#to_a, not from Range#to_a. Try this instead:
(0..10).to_a