Question

Given an Array A of n subArrays Sn, how can I select the Array of Sn[i] members in Ruby?

For instance, given an Array of languages as the following:

languages = [ ['Italiano', 'it'], ["English", 'en'], ["Française", 'fr' ] ]

How can I obtain the Array…

locales_in_languages = ['it', 'en', 'fr' ]

…which contains all the language[1] objects?

Is there an easy and ‘rubysh’ way to achieve this?

Answer 1

You can do it with Array#transpose method:

irb(main):014:0> languages = [ ['Italiano', 'it'], ["English", 'en'], ["Française", 'fr' ] ]
=> [["Italiano", "it"], ["English", "en"], ["Française", "fr"]]
irb(main):015:0> languages.transpose[1]
=> ["it", "en", "fr"]