casecmp? is a String class method in Ruby which is used to return true if both the string are equal after Unicode case folding and false if they are not equal.
Parameters: Here, str is the given string to be checked and other_str is the string to which str is compared.
Returns: This method will returns the numbers based on the equality of the str and other_str. It can also return nil if the two strings have incompatible encodings, or if other_str is not a string.
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