Get array of coma separated integer from array of string in ruby

Question

I have the array of string like,

a = ["13", "---\n- '5'\n- 19\n- 20\n", "---\n- 21\n", "---\n- 21\n- 22\n", "---\n- 21\n- 22\n"]

but i want converted array like,

a = ["13","5,19,20","21","21,22","21,22"]

I have already tried Regexp and gsub, but i didn't get array as i want. Please help if any one know.

@AvinashRaj In loop i was doing like this b << c.gsub(/[^0-9]/,' ').strip and as output i.e ["13", "5 19 20", "21", "21 22", "21 22"]. But i got answer from shivam. — rick
– rick, Commented Dec 11, 2014 at 8:28
@Stefan No i am getting this data from database not from YAML file. — rick
– rick, Commented Dec 11, 2014 at 12:30

shivam · Accepted Answer · 2014-12-11 08:23:39Z

2

Regex scanning for integers and joining them with ,

a = ["13", "---\n- '5'\n- 19\n- 20\n", "---\n- 21\n", "---\n- 21\n- 22\n", "---\n- 21\n- 22\n"]
a.map{|b| b.scan(/\d+/).join(',')}
# => ["13", "5,19,20", "21", "21,22", "21,22"]

Note: Assuming no negatives in input array (as asked in a comment)

answered Dec 11, 2014 at 8:23

shivam

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3 Comments

xlembouras Over a year ago

you can use /-?\d+/ to include the negatives as well

rick Over a year ago

@xlembouras yup we can use that as well. Thanks for your suggestion.

shivam Over a year ago

@xlembouras and avinash thanks for adding more value to my answer. +1

Cary Swoveland · Accepted Answer · 2014-12-11 09:41:49Z

1

You could also do it by joining, using gsub, then splitting and formating:

a.join(',').gsub(/[^\d,]/, ' ').split(',').map { |s| s.split.join(',') }
  #=> ["13", "5,19,20", "21", "21,22", "21,22"]

answered Dec 11, 2014 at 9:41

Cary Swoveland

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