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arr = [1,2,3,nil,nil]
puts arr.compact.inspect
puts arr.inspect

# compact!: return array with no nil like compact and also make changes on arr
puts arr.compact!.inspect 
puts arr.inspect

[1, 2, 3]

[1, 2, 3, nil, nil]

[1, 2, 3]

[1, 2, 3]




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