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Answers and rating deltas for

I want to replace last comma with "and " in a string using javascript

Author Votes Δ
bribeiro 1 +4.03
Viswanath D 0 -0.06
knittl 0 -0.49
Varun Achar 0 +0.04
Last visited: May 1, 2015, 9:56:44 PM