Other Useful Methods

Strings share several other methods with arrays, such as:

• length - returns the number of characters in a string;
• reverse - reverses the order of the string and returns the result (it does not modify its receiver);
• reverse! - the same as reverse except it modifies its receiver;
• include? - returns a boolean (true or false) indicating whether its argument is included in the string.

Case Manipulation

Strings feature several methods for manipulating case. The most common are downcase and upcase. downcase replaces all uppercase letters with their lowercase counterparts, and upcase replaces all lowercase letters with their uppercase counterparts. Both methods do not modify the original string but have dangerous versions.