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Does Python support short-circuiting?
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318
Yep, both and and or operators short-circuit -- see the docs.
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Django self-referential foreign key
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edited May 25 at 16:21
Zags
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Singleton by Jon Skeet clarification
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No, this is nothing to do with closures. A nested class has access to its outer class's private...
Declaration suffix for decimal type
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Documented in the C# language specification, chapter 2.4.4:
float f = 1.2f;
double d = 1.2d;
uint u = 2u;
long l = 2L;
ulong ul = 2UL;
decimal m = 2m;
Nothing for int, byte, sbyte, short, ushort.
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Rails where condition using NOT NIL
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516
The canonical way to do this with Rails 3:
Foo.includes(:bar).where("bars.id IS NOT NULL")
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Declaring an enum within a class
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answered Mar 23 '10 at 21:42
Peter AlexanderPeter Alexander
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Scala 2.8 breakOut
...e the best builder possible. For example, if I were to write Map('a' -> 1).map(_.swap), I'd like to get a Map(1 -> 'a') back. On the other hand, a Map('a' -> 1).map(_._1) can't return a Map (it returns an Iterable).
The magic of producing the best possible Builder from the known types of t...
Find first element in a sequence that matches a predicate
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edited Mar 21 at 7:28
answered Dec 16 '11 at 12:48
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Turn off constraints temporarily (MS SQL)
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You can disable FK and CHECK constraints only in SQL 2005+. See ALTER TABLE
ALTER TABLE foo NO...
How do I byte-compile everything in my .emacs.d directory?
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C-u 0 M-x byte-recompile-directory
will compile all the .el files in the directory and in all ...