What is exclamation mark in ruby

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  Ruby negative indices fizz buzz

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  SyntaxError: /mnt/c/myAppFile/hello-rails-react/app/javascript/components/Greeting.js: Support for the experimental syntax 'jsx' isn't currently enabled rails

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  Ruby each char with index

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  Iterate over each key value in hash ruby

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  How to add to array ruby

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  Ruby array replace element

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  Text_field_tag rails

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  Full error messages rails

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  Params except rails

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