Hi!

I have a two-dimensional array Farr.

Farr.each{ |i| print i}

output:
["200912-829", 9]
["200912-893", 3]
["200912-893", 5]
["200912-829", 1]
["200911-818", 6]
["200911-893", 1]
["200911-827", 2]

I'm trying to get another two-dimensional array, which would be the
grouping of the first elements.
In SQL it would be so:

select String, sum(Number)
from Farr
group by String

and the resulting array would:
["200912-829", 10]
["200912-893", 8]
["200911-818", 6]
["200911-893", 1]
["200911-827", 2]

Help please.
I apologize for spelling, English is not my native.