How to combine subarrays within an array in Ruby?

Question

How would I combine the subarrays within this array

[["0", "0", "0"], ["0", "0", "0"], ["1"]]

I want to add a comma in between each subarrays so that it would read 000,000,1.

I have tried using *"," but it will combine the whole array together and give me 0,0,0,0,0,0,1 instead. Thanks for your help!

000,000,1 is not an object. Is it "000,000,1", or ["000","000","1"] or something else? — Cary Swoveland
– Cary Swoveland, Commented Feb 26, 2015 at 6:48

spickermann · Accepted Answer · 2015-02-26 06:45:58Z

4

First join the inner arrays:

 array.map(&:join)
 # => ["000", "000", "1"]

That join that array, but this time with a , as a separator:

 array = ["000", "000", "1"]
 array.join(',')
 # => "000,000,1"

Or as a one liner:

 array = [["0", "0", "0"], ["0", "0", "0"], ["1"]]
 array.map(&:join).join(',')
 # => "000,000,1"

answered Feb 26, 2015 at 6:45

spickermann

108k9 gold badges115 silver badges147 bronze badges

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

1 Answer 1