ruby - Calculate insersection from arrays using & operator -

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i taking number of array , want calculate insersection arrays using & operator in case after calculate intersection str1 & str in str1 array, str1 empty.

n = gets.strip.to_i str1 = array.new str2 = array.new in 0..n-1   str = gets.strip.split("").map { |s| s.to_s }   if < 1     str1 << str     #puts str1.kind_of?(array)     #puts str.kind_of?(array)   else     #puts str1      #puts "no"     #puts str     str1 = str1 & str     puts str1   end end puts str1.length 

str1 << str

appends array str array str1 (so ['a', 'b', 'c', ['d', 'e', 'f']]). want assignment instead:

str1 = str

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