ruby - Printing elements of an array with a comma -

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i have array arr = ["test", "test 1", "test 2"]. how print test, test 1, test 2.? note "." , "," in expected output.

i know how iterate on doing:

arr.each |a|     puts end

but i'm not sure how expected output.

puts arr.join(' , ')+'.'

with trailing period.


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