Ruby create a specific array from range

Question

I was wondering how can I generate the following array using ranges in ruby

["00","00","01","01","02", "02", ...... "10", "10"]

I want to repeat each element twice thats the part that I am looking an answer for. I can generate single elements as below

("00".."10").to_a

I know I can do this using loops etc but I am looking for a simpler one line code

Thanks

clyfe · Accepted Answer · 2012-06-29 12:47:35Z

8

Use Array#zip and Array#flatten:

a = ("00".."10").to_a
a.zip(a).flatten
# ["00", "00", "01", "01", "02", "02", "03", "03", "04", "04", "05", "05", "06", "06", "07", "07", "08", "08", "09", "09", "10", "10"]

answered Jun 29, 2012 at 12:47

clyfe

23.8k8 gold badges88 silver badges110 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

tokland · Accepted Answer · 2014-01-17 14:17:11Z

7

("00".."10").flat_map { |x| [x, x] }
#=> ["00", "00", "01", "01", ..., "10", "10"]

edited Jan 17, 2014 at 14:17

answered Jun 29, 2012 at 12:59

tokland

68.2k13 gold badges151 silver badges174 bronze badges

Collectives™ on Stack Overflow

Ruby create a specific array from range

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related