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Videos can be viewed on: Windows 8, Windows XP, Vista, 7, and all versions of Macintosh OS X including the iPad, and other platforms that support the industry standard h.264 video codec.
In this lesson you'll learn about the number and string objects provided by the Foundation Framework, as well the difference between mutable vs. immutable objects, how to use strings in your applications, and how to perform operations on strings – e.g., how to concatenate, search, copy, format or test strings.