Unique values in hash?

[Vapor ..]

Hi,

I have a hash that contains duplicate data, for example, :username =>
"alex" comes many times.
I want to loop around and print their names just once (only unique). In
simple loop it would print "alex" repeatedly.

Thanks.

 

[Robert Klemme]

I have a hash that contains duplicate data, for example, :username =>
"alex" comes many times.
I want to loop around and print their names just once (only unique). In
simple loop it would print "alex" repeatedly.

irb(main):001:0> {:foo=>1,:bar=>1}.values.uniq
=> [1]

You can of course have more involved solutions, e.g. (shameless self promotion):

http://redhanded.hobix.com/bits/klemmeSSilentHash.html
;-)

Cheers

robert

 

[Rupert Voelcker]

I have a hash that contains duplicate data, for example, :username =>

"alex" comes many times.
I want to loop around and print their names just once (only unique). In
simple loop it would print "alex" repeatedly.

hash.map { |k,v| v }.uniq.each { |name| puts name }

should do it

Rupert

 

[David A. Black]

Hi --

I have a hash that contains duplicate data, for example, :username =>
"alex" comes many times.
I want to loop around and print their names just once (only unique). In
simple loop it would print "alex" repeatedly.

irb(main):001:0> {:foo=>1,:bar=>1}.values.uniq
=> [1]

You can of course have more involved solutions, e.g. (shameless self promotion):

http://redhanded.hobix.com/bits/klemmeSSilentHash.html
;-)

hash.invert.keys #


David