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The Ruby %r{ } expression
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%r{} is equivalent to the /.../ notation, but allows you to have '/' in your regexp without having to escape them:
%r{/home/user}
is equivalent to:
/\/home\/user/
This is only a syntax commodity, for legibility.
Edit:
Note that you can use almost any non-alphabet...
Is SecureRandom thread safe?
... initializing a SecureRandom can not only be slow, but can potentially hang because of missing entropy
– Walter Tross
Jul 25 '14 at 9:37
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JPA: How to have one-to-many relation of the same Entity type
...em.persist(daughter);
em.getTransaction().commit();
}
In this case, all three entity instances must be persisted before transaction commit. If I fail to persist one of the entities in the graph of parent-child relationships, then an exception is thrown on commit(). On Eclipselink, this is a...
What's the difference between RouteLink and ActionLink in ASP.NET MVC?
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+1 for a great blog post. Really handy. And shows there's just too many possibilities. MS guys should only implement the fastest. But people rather use the fancy lambda slowest one.
– Robert Koritnik
Oct 21 '09 at ...
Creating an index on a table variable
...ds of adding constraint based indexes discussed below SQL Server 2014 also allows non unique indexes to be specified directly with inline syntax on table variable declarations.
Example syntax for that is below.
/*SQL Server 2014+ compatible inline index syntax*/
DECLARE @T TABLE (
C1 INT INDEX IX...
How to prove that a problem is NP complete?
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As far as I remember, there is a theorem called the Cook-Levin theorem which states that SAT is NP-complete. That proof is quite a bit more complicated than what I outlined above and I don't think I can explain it in my own words.
– Laila Agaev
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Access Asset Catalog programmatically
...ove to be able to use an Asset Catalog to organize my assets, but I access all of my images programmatically. How would I access my images, now? Do I still access them by their file names like so:
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Unpacking, extended unpacking and nested extended unpacking
...luating these "by hand," I'll suggest some simple substitution rules. Basically, you might find it easier to understand an expression if all the iterables are formatted in the same way.
For the purposes of unpacking only, the following substitutions are valid on the right side of the = (i.e. for rv...
Check if $_POST exists
...sts and if it does, print it inside another string, if not, don't print at all.
14 Answers
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How to add a footer to a UITableView in Storyboard
...cell, it shows in the start of the Table. While below it is not showing at all. Any Reason why @JohnBrewer
– AsifHabib
Mar 15 '16 at 15:16
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