Can anyone recommend a good introductory article on Ruby?

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Decided to learn Ruby. Never before with the language encountered.
So, if anyone had in mind some small concise article (in English), which makes an excursion into a few convenient non-standard concepts such as blocks, lambda & proc, postconditions, safe navigation operator, etc. in accessible language.
I would be really grateful.

PS. If anyone can recommend a good book, without too much water - that is also huge respect.
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Book: Peter Cooper. Beginning Ruby: From Novice to Professional
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