August 2005
Beginner
256 pages
8h 26m
English
Content preview from Digital IdentityBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Naming
Naming is one of the fundamental abstractions for dealing with complexity. Names provide convenient handles for large, complex things—allowing them to be manipulated and referenced by some short, easy-to-remember string, instead of a longer, unwieldy representation. Filenames, for example, let us pick a meaningful handle for what ultimately is a collection of bits located on a particular set of sectors on a particular set of tracks on a particular set of disks.
Names also disassociate the reference from the thing itself, so that the underlying representation can change without changing the name. Perhaps the most familiar example of this is domain names. The domain name http://windley.com points to some IP address. If I decide to change the machine hosting the services at http://windley.com to another one with a different IP address, it's easily done and everyone referring to the name will still end up with the services that they are looking for.
Namespaces
A namespace is the universe within which a name is guaranteed to be unique and defines where the name has meaning. For this reason, namespaces are sometimes called "domains ." A family name (usually) acts as a namespace wherein given names are unique and meaningful. In an email address, the name (the part before the @ symbol) is guaranteed to be unique within the namespace (the part after the @ symbol). Filenames are unique within the namespace of the directory in which they reside.
Namespaces can be flat or hierarchical . ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.