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Ruby check if string is integer

Ruby is int

1.is_a? Integer
=> true
"dadadad@asdasd.net".is_a? Integer
=> false
nil.is_a? Integer
=> false

1

Source: stackoverflow.com

Ruby test is number

12.is_a? Numeric

0

Source: stackoverflow.com

Ruby check if string is integer

class String
  def numeric?
    Float(self) != nil rescue false
  end
end
"Hello World!".numeric?

-1

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