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What does .SD stand for in data.table in R
...h Matt Dowle about .SD, you can see it on YouTube: https://www.youtube.com/watch?v=DwEzQuYfMsI
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Using Kafka as a (CQRS) Eventstore. Good idea?
...Redis Notifications). Since Redis allows for optimistic concurrency (using Watch/multi-exec), this should work
– Geert-Jan
Oct 16 '14 at 15:28
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Why is the order in dictionaries and sets arbitrary?
...the C implementation for all the (well documented) details. You could also watch this Pycon 2010 presentation by Brandon Rhodes about how CPython dict works, or pick up a copy of Beautiful Code, which includes a chapter on the implementation written by Andrew Kuchling.
Note that as of Python 3.3, a...
Is floating point math broken?
...or a single operation, the error will grow over repeated operations if not watched. This is the reason that in computations that require a bounded error, mathematicians use methods such as using the round-to-nearest even digit in the last place of IEEE-754, because, over time, the errors are more li...
How should a model be structured in MVC? [closed]
...eed an external API
How to interact with a model?
Prerequisites: watch lectures "Global State and Singletons" and "Don't Look For Things!" from the Clean Code Talks.
Gaining access to service instances
For both the View and Controller instances (what you could call: "UI layer") to have ...
Fundamental difference between Hashing and Encryption algorithms
...ly impossible to crack (there's a great movie about it). Today, your smart watch could easily crack it. DES was once thought strong, as was MD5. Today's strong encryption threatens to fall easy prey to quantum computing techniques in the forseeable future.
– Eric J.
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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...讲《Transaction Across DataCenter》（视频： http://www.youtube.com/watch?v=srOgpXECblk）
前面，我们说过，要想让数据有高可用性，就需要冗余数据写多份。写多份的问题会带来一致性的问题，而一致性的问题又会带来性能问题。从上图我...
HTML5 Canvas Resize (Downscale) Image High Quality?
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Ok, so i watched the code : you were very near from solution. Two mistakes : your indexes were off by one for tX+1 (they were +3,+4,+5,+6 instead of +4, +5, +6, +7), and changing line in rgba is a mul by 4, not 3. I just tested 4 rand...
passport.js RESTful auth
...keeps it in the client context. I don't have an example ready to show, but watch out for a second part to this tutorial on my blog where I'll show how it is done: blog.miguelgrinberg.com/post/…
– Miguel
Jun 2 '13 at 19:05
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Bidirectional 1 to 1 Dictionary in C#
...nt info) and DebuggerTypeProxyAttribute (for displaying key-value pairs in watches).
Reverse dictionary is available as IDictionary<TValue, TKey> Reverse property and also implements all interfaces mentioned above. All operations on either dictionaries modify both.
Usage:
var dic = new BiDi...