Unlambda Checker

Been looking at Unlambda. and it’s website offers a simple algorithm for determining whether or not a string is a valid Unlambda program

def unlambda_checker(input)
     counter = 0
     input.split(//).each { |x| x == '`' ? counter += 1 : counter -= 1 }
     counter == 0
end

This has undergone rudimentary testing

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