Distinct

ruby-talk
1

hello,

  a little question... how to get distinct values from an hash?

ex:
hash = {"a"=>100, "b"=>200, "d"=>100, "d"=>200}
==> hash_with_distinct_values = [100, 200]

thanks.

2

Jean-Sébastien wrote:

hello,

  a little question... how to get distinct values from an hash?

ex:
hash = {"a"=>100, "b"=>200, "d"=>100, "d"=>200}
==> hash_with_distinct_values = [100, 200]

hash.values.uniq is the simplest.

···

--
Alex

3

irb(main):001:0> hash = {"a"=>100, "b"=>200, "d"=>100, "d"=>200}
=> {"a"=>100, "b"=>200, "d"=>200}
irb(main):002:0> hash.invert.keys
=> [100, 200]

···

On Fri, Apr 13, 2007 at 12:55:06AM +0900, Jean-S?bastien wrote:

  a little question... how to get distinct values from an hash?

ex:
hash = {"a"=>100, "b"=>200, "d"=>100, "d"=>200}
==> hash_with_distinct_values = [100, 200]

4

irb(main):001:0> hash = {"a"=>100, "b"=>200, "d"=>100, "d"=>200}
=> {"a"=>100, "b"=>200, "d"=>200}
irb(main):002:0> hash.values.uniq
=> [100, 200]

···

On Apr 12, 11:54 am, "Jean-Sébastien" <jeansebastien....@gmail.com> wrote:

hello,

  a little question... how to get distinct values from an hash?

ex:
hash = {"a"=>100, "b"=>200, "d"=>100, "d"=>200}
==> hash_with_distinct_values = [100, 200]

thanks.

5

I would have completely agreed with hash.values.uniq as the simplest
solution, but has.invert.keys is extremely surprising, thx Brian.

Robert

···

On 4/12/07, Brian Candler <B.Candler@pobox.com> wrote:

On Fri, Apr 13, 2007 at 12:55:06AM +0900, Jean-S?bastien wrote:
> a little question... how to get distinct values from an hash?
>
> ex:
> hash = {"a"=>100, "b"=>200, "d"=>100, "d"=>200}
> ==> hash_with_distinct_values = [100, 200]

irb(main):001:0> hash = {"a"=>100, "b"=>200, "d"=>100, "d"=>200}
=> {"a"=>100, "b"=>200, "d"=>200}
irb(main):002:0> hash.invert.keys
=> [100, 200]

--
You see things; and you say Why?
But I dream things that never were; and I say Why not?
-- George Bernard Shaw