ruby - How to remove a trailing comma? -

given strings like:

bob bob, bob bob burns,

how can return w/o comma?

bob bob bob bob burns

also, want method not break if passed nil, return nil?

def remove_trailing_comma(str)   !str.nil? ? str.replace(",") :nil end

my thought use string.chomp:

returns new string given record separator removed end of str (if present).

does want?

def remove_trailing_comma(str)     str.nil? ? nil : str.chomp(",") end

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