Simple array of strings sorting

ruby-talk
1

Say I have an array of strings that looks like this:
test-3
test-31
test-11
test-12
test-13
test-32
test-10
test-14

I want them sorted like so:
test-3
test-10
test-11
test-12
test-13
test-14
test-31
test-32

arr.sort doesn't seem to work the way I need. Any help?
Thanks

2

The sequences of numerals need to be treated as numbers,
not strings.

" test-3
test-31
test-11
test-12
test-13
test-32
test-10
test-14 ".split.sort_by{|s| s[/\d+/].to_i}
    ==>["test-3", "test-10", "test-11", "test-12", "test-13",
"test-14", "test-31", "test-32"]

···

On Feb 21, 11:54 am, Ed <pyro...@gmail.com> wrote:

Say I have an array of strings that looks like this:
test-3
test-31
test-11
test-12
test-13
test-32
test-10
test-14

I want them sorted like so:
test-3
test-10
test-11
test-12
test-13
test-14
test-31
test-32

arr.sort doesn't seem to work the way I need. Any help?
Thanks

3

Say I have an array of strings that looks like this:
test-3
test-31
test-11
test-12
test-13
test-32
test-10
test-14

I want them sorted like so:
test-3
test-10
test-11
test-12
test-13
test-14
test-31
test-32

arr.sort doesn't seem to work the way I need. Any help?

It's sorting lexicographically rather than numerically. Try this instead:

arr.sort_by { |x| x.split('-').last.to_i }

In IRB:

>> arr = %w( test-3 test-31 test-11 test-12 test-13 test-32 test-10 test-14 )
=> ["test-3", "test-31", "test-11", "test-12", "test-13", "test-32", "test-10", "test-14"]
>> arr.sort
=> ["test-10", "test-11", "test-12", "test-13", "test-14", "test-3", "test-31", "test-32"]
>> arr.sort_by { |x| x.split('-').last.to_i }
=> ["test-3", "test-10", "test-11", "test-12", "test-13", "test-14", "test-31", "test-32"]

Regards,
Andy Stewart

···

On 21 Feb 2008, at 17:55, Ed wrote:

-------

4

Thanks for the response.
arr.split.sort_by{ |s| s[/\d+/].to_i } produces this error message:
"can't convert Regexp into Integer"

···

On Feb 21, 1:06 pm, William James <w_a_x_...@yahoo.com> wrote:

On Feb 21, 11:54 am, Ed <pyro...@gmail.com> wrote:

> Say I have an array of strings that looks like this:
> test-3
> test-31
> test-11
> test-12
> test-13
> test-32
> test-10
> test-14

> I want them sorted like so:
> test-3
> test-10
> test-11
> test-12
> test-13
> test-14
> test-31
> test-32

> arr.sort doesn't seem to work the way I need. Any help?
> Thanks

The sequences of numerals need to be treated as numbers,
not strings.

" test-3
test-31
test-11
test-12
test-13
test-32
test-10
test-14 ".split.sort_by{|s| s[/\d+/].to_i}
    ==>["test-3", "test-10", "test-11", "test-12", "test-13",
"test-14", "test-31", "test-32"]

5

Works perfectly. Thanks a lot.

···

On Feb 21, 1:14 pm, Andrew Stewart <b...@airbladesoftware.com> wrote:

On 21 Feb 2008, at 17:55, Ed wrote:

> Say I have an array of strings that looks like this:
> test-3
> test-31
> test-11
> test-12
> test-13
> test-32
> test-10
> test-14

> I want them sorted like so:
> test-3
> test-10
> test-11
> test-12
> test-13
> test-14
> test-31
> test-32

> arr.sort doesn't seem to work the way I need. Any help?

It's sorting lexicographically rather than numerically. Try this
instead:

arr.sort_by { |x| x.split('-').last.to_i }

In IRB:

>> arr = %w( test-3 test-31 test-11 test-12 test-13 test-32 test-10
test-14 )
=> ["test-3", "test-31", "test-11", "test-12", "test-13", "test-32",
"test-10", "test-14"]
>> arr.sort
=> ["test-10", "test-11", "test-12", "test-13", "test-14", "test-3",
"test-31", "test-32"]
>> arr.sort_by { |x| x.split('-').last.to_i }
=> ["test-3", "test-10", "test-11", "test-12", "test-13", "test-14",
"test-31", "test-32"]

Regards,
Andy Stewart

-------http://airbladesoftware.com

6

William was splitting the string as an example, not an array. Try...

arr.sort_by { |s| s[/\d+/].to_i }

... if you trust your data (i.e. you don't accidentally have numbers
hanging out elsewhere, like test1-41)

Todd

···

On Thu, Feb 21, 2008 at 12:20 PM, Ed <pyroguy@gmail.com> wrote:

On Feb 21, 1:06 pm, William James <w_a_x_...@yahoo.com> wrote:
> On Feb 21, 11:54 am, Ed <pyro...@gmail.com> wrote:
>
>
>
> > Say I have an array of strings that looks like this:
> > test-3
> > test-31
> > test-11
> > test-12
> > test-13
> > test-32
> > test-10
> > test-14
>
> > I want them sorted like so:
> > test-3
> > test-10
> > test-11
> > test-12
> > test-13
> > test-14
> > test-31
> > test-32
>
> > arr.sort doesn't seem to work the way I need. Any help?
> > Thanks
>
> The sequences of numerals need to be treated as numbers,
> not strings.
>
> " test-3
> test-31
> test-11
> test-12
> test-13
> test-32
> test-10
> test-14 ".split.sort_by{|s| s[/\d+/].to_i}
> ==>["test-3", "test-10", "test-11", "test-12", "test-13",
> "test-14", "test-31", "test-32"]

Thanks for the response.
arr.split.sort_by{ |s| s[/\d+/].to_i } produces this error message:
"can't convert Regexp into Integer"