43 karma · joined June 15, 2009
Or they could have used a small Product table with common fields and made fanout tables for Books and Laptops. For some reason it appears impossible for some to create new tables, or have joins and foreign keys.
The uniqueness of Skype is overstated, the principal advantage is the same that using Facebook has over using any open standard social networking, everyone you want to contact is on it. So Skype and Facebook are a good match, both are walled gardens with limited (or no) interoperability or support for open standards.
Just like with ordered hashes, using hashes with non-string keys needs programming on your part (perhaps overloading stringification for your object and providing a way to get your object back from the string) or others (CPAN). Or you could overload (or just add to) the object and provide an accessor for your value so you can set it on the object itself.
http://www.opengroup.org/onlinepubs/000095399/utilities/sh.h...
Interesting note about emacs mode though:
In early proposals, the KornShell-derived emacs mode of command line editing was included, even though the emacs editor itself was not. The community of emacs proponents was adamant that the full emacs editor not be standardized because they were concerned that an attempt to standardize this very powerful environment would encourage vendors to ship strictly conforming versions lacking the extensibility required by the community. The author of the original emacs program also expressed his desire to omit the program. Furthermore, there were a number of historical systems that did not include emacs, or included it without supporting it, but there were very few that did not include and support vi. The shell emacs command line editing mode was finally omitted because it became apparent that the KornShell version and the editor being distributed with the GNU system had diverged in some respects. The author of emacs requested that the POSIX emacs mode either be deleted or have a significant number of unspecified conditions. Although the KornShell author agreed to consider changes to bring the shell into alignment, the standard developers decided to defer specification at that time. At the time, it was assumed that convergence on an acceptable definition would occur for a subsequent draft, but that has not happened, and there appears to be no impetus to do so. In any case, implementations are free to offer additional command line editing modes based on the exact models of editors their users are most comfortable with.