Check whether a value is present in an array in Ruby


How to check if a certain value is contained in an array in Ruby? For example, I want to know if 'A' is present in the vector ['A','B','C'] .


Use the include? method include? .

a = [ "a", "b", "c" ]
a.include?("b")   #=> true
a.include?("z")   #=> false
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