"ruby in array" Code Answer's
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ruby array has element
>> ['Cat', 'Dog', 'Bird'].include? 'Dog'
=> true
Source: stackoverflow.com
ruby find in array
(1..10).detect { |i| i % 5 == 0 and i % 7 == 0 } #=> nil
(1..10).find { |i| i % 5 == 0 and i % 7 == 0 } #=> nil
(1..100).detect { |i| i % 5 == 0 and i % 7 == 0 } #=> 35
(1..100).find { |i| i % 5 == 0 and i % 7 == 0 } #=> 35
Source: apidock.com
ruby in array
You can just use a set difference (aka minus) to see if one array includes all elements of another
not_included = [1,2,3] - (1..9).to_a
not_included # => []
not_included = [1,2,3,'A'] - (1..9).to_a
not_included # => ["A"]
Source: apidock.com
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