get rid of last element in an array

[Josselin]

if i have

my_list = "2-131-25-5558-247-68"

and I want to get rid of the last element...
I wrote :

my_list.split('-') - my_list.split('-').last.to_a => "22-13-25-58-47"

which runs well.. but isn't too complex.... ?

tfyl

joss

 

[James Edward Gray II]

if i have

my_list = "2-131-25-5558-247-68"

and I want to get rid of the last element...

I would use a regular expression:
=> "2-131-25-5558-247"

Hope that helps.

James Edward Gray II

 

[Derek Teixeira]

if i have

my_list = "2-131-25-5558-247-68"

and I want to get rid of the last element...
I wrote :

my_list.split('-') - my_list.split('-').last.to_a =>
"22-13-25-58-47"

which runs well.. but isn't too complex.... ?

tfyl

joss

i'm a newb, and i am probably totally wrong, but the only way to learn
is to test what you think ...

won't the .pop method work? or does that only get rid of the last thing
entered?

 

[Wolfgang Nádasi-Donner]

if i have

my_list = "2-131-25-5558-247-68"

and I want to get rid of the last element...
I wrote :

my_list.split('-') - my_list.split('-').last.to_a =>
"22-13-25-58-47"

which runs well.. but isn't too complex.... ?

tfyl

joss

irb(main):001:0> my_list = "2-131-25-5558-247-68"
=> "2-131-25-5558-247-68"
irb(main):002:0> my_list.split('-') - my_list.split('-').last.to_a
=> ["2", "131", "25", "5558", "247"]
irb(main):003:0> my_list.split('-')[0..-1].join('-')
=> "2-131-25-5558-247-68"
irb(main):004:0> my_list.split('-')[0..-2].join('-')
=> "2-131-25-5558-247"
irb(main):005:0> my_list.split('-')[0..-3].join('-')
=> "2-131-25-5558"
irb(main):006:0> my_list.sub(/(?:-\d+)$/, '')
=> "2-131-25-5558-247"
irb(main):007:0> my_list.sub(/(?:-\d+){2}$/, '')
=> "2-131-25-5558"
irb(main):008:0> my_list.sub(/(?:-\d+){3}$/, '')
=> "2-131-25"

Some ideas...

Wolfgang Nádasi-Donner

 

[David Vallner]

my_list =3D "2-131-25-5558-247-68"

D:\UserPrfs\VALLNERD>irb
irb(main):001:0> "2-131-25-5558-247-68".split('-')[0...-1].join('-')
=3D> "2-131-25-5558-247"

Reads for me a little better than the RE version.

David Vallner

 

[David Vallner]

won't the .pop method work? or does that only get rid of the last thing
entered?

Array#pop will remove the last element from the original stringified list,
which might or might not be what you want - the methods in the other posts
only result in a new string with the last element removed.

Also, #pop will return the popped value, not the original array, which
prevents you from making a single-method-chain-oneliner, a popular Rubyist
sport ;P

David Vallner

 

[Derek Teixeira]

Array#pop will remove the last element from the original stringified

list,
which might or might not be what you want - the methods in the other
posts
only result in a new string with the last element removed.

Also, #pop will return the popped value, not the original array, which
prevents you from making a single-method-chain-oneliner, a popular
Rubyist
sport ;P

David Vallner

Ah, okay. Well at least i was not COMPLETELY off.

Derek

 

[Nicolas Desprès]

if i have

my_list = "2-131-25-5558-247-68"

and I want to get rid of the last element...

If you want to keep your list as a string:

my_list.sub(/-\d+$/, '')

or if you want your list as an array:

my_array = my_list.split(/-/)
my_array.delete_at(-1)

Cheers,

Nico