ruby/rails how to insert column into multidimensional array

Question

I have an array arr = [[1,2],[3,4]] and a column col = [5,6]

Is there an easy way to get an output of [[1,2,5],[3,4,6]] without looping? Thanks

Peter Alfvin · Accepted Answer · 2013-12-16 22:15:59Z

5

Yes, using Array#transpose as follows:

arr = [[1,2],[3,4]]
col = [5,6]
pp (arr.transpose << col).transpose # => [[1, 2, 5], [3, 4, 6]]

answered Dec 16, 2013 at 22:06

Peter Alfvin

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2 Comments

@mechanicalfish Just wanted to let you know the comment you responded to was deleted in case you wanted to delete yours. :-)

What about inserting the new column in to the first index?