Sorting through an array of an array

ruby-talk
1

Hello.

Each of my arrays look like this:
container[0] = ["foo", "bar", "baz"]
container[1] = ["doo", "poo", "woo"]

i'd like to sort by the second position (bar, and poo)
and of course,affecting the whole row, so that "bar" should be on top,
along with "foo" and "baz" as container[0].

What method should i use?

Thanks

···

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2

container.sort { |row1, row2| row1[1] <=> row2[1] }

Josh

···

On 10/13/06, Dominic Son <dominicson@gmail.com> wrote:

Hello.

Each of my arrays look like this:
container[0] = ["foo", "bar", "baz"]
container[1] = ["doo", "poo", "woo"]

i'd like to sort by the second position (bar, and poo)
and of course,affecting the whole row, so that "bar" should be on top,
along with "foo" and "baz" as container[0].

What method should i use?

--
Josh Knowles
joshknowles@gmail.com
http://joshknowles.com

3

In article <1a701a2f74c6f4245c0092667a764972@ruby-forum.com>,

···

Dominic Son <dominicson@gmail.com> wrote:

Hello.

Each of my arrays look like this:
container[0] = ["foo", "bar", "baz"]
container[1] = ["doo", "poo", "woo"]

i'd like to sort by the second position (bar, and poo)
and of course,affecting the whole row, so that "bar" should be on top,
along with "foo" and "baz" as container[0].

What method should i use?

container.sort { |x,y| x[1]<=>y[1] }
--
Mark Ping
emarkp@soda.CSUA.Berkeley.EDU

4

Actually, the better way to sort in this scenario is to use sort_by.

container.sort_by {|x| x[1]}

No need to mess with the <=> operator by hand.

Brian.

···

On 10/13/06, Dominic Son <dominicson@gmail.com> wrote:

Hello.

Each of my arrays look like this:
container[0] = ["foo", "bar", "baz"]
container[1] = ["doo", "poo", "woo"]

i'd like to sort by the second position (bar, and poo)
and of course,affecting the whole row, so that "bar" should be on top,
along with "foo" and "baz" as container[0].

What method should i use?

5

But how to do apply this to having 3 elements in the value of an array?

container.sort_by { |x,y,z| *lost here*
  puts x <br>
  puts y <br>
  puts z <br>
                  }

Brian Mitchell wrote:

···

On 10/13/06, Dominic Son <dominicson@gmail.com> wrote:

What method should i use?

Actually, the better way to sort in this scenario is to use sort_by.

container.sort_by {|x| x[1]}

No need to mess with the <=> operator by hand.

Brian.

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Posted via http://www.ruby-forum.com/\.

6

Having more entries in the array doesn't change the number of
arguments to the block.

a =
a << [1,2,3]
a << [4,5,6]
a << [7,8,9]

a.sort_by do |element|
  [element[0], element[1], element[2]]
end

If you return an Array from sort_by's block, it will sort on the
entries of the array in order.

In this trivial case, since you're sorting by all three, you could
just write the above as:
a.sort_by {|e| e}
(since 'e' is already an Array in the proper order)

···

On 10/13/06, Dominic Son <dominicson@gmail.com> wrote:

But how to do apply this to having 3 elements in the value of an array?

container.sort_by { |x,y,z| *lost here*
  puts x <br>
  puts y <br>
  puts z <br>
                  }

7

container.sort_by {|x| x[2]}

···

On 10/13/06, Dominic Son <dominicson@gmail.com> wrote:

But how to do apply this to having 3 elements in the value of an array?

container.sort_by { |x,y,z| *lost here*
  puts x <br>
  puts y <br>
  puts z <br>
                  }

Brian Mitchell wrote:
> On 10/13/06, Dominic Son <dominicson@gmail.com> wrote:
>> What method should i use?
> Actually, the better way to sort in this scenario is to use sort_by.
>
> container.sort_by {|x| x[1]}
>
> No need to mess with the <=> operator by hand.
>
> Brian.

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