Web Reference: Jul 23, 2025 · In this article, we will discuss how to convert a string to lower or upper case in Ruby. We can convert a string to lower or upper case using built-in methods provided in the Ruby language. Feb 26, 2025 · Learn how to convert strings to lowercase or uppercase in Ruby with simple methods. This article provides clear examples and explanations for both downcase and upcase, as well as their in-place variants. How to convert String to Uppercase in Ruby ? To convert a string to uppercase in Ruby, you can use the upcase() method of the String class.
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