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Java's Virtual Machine and CLR
...in run-time environments: bytecode compilation and dynamic compilation. It converts code at runtime prior to executing it natively, for example bytecode into native machine code. The performance improvement over interpreters originates from caching the results of translating blocks of code, and not ...
Hibernate vs JPA vs JDO - pros and cons of each? [closed]
...m heavy database/SQL/stored procedure/JDBC school myself. I can't say I am convert - every technology above still has a place to be. But for general purpose Java 3-tier application (no matter what size) first choice is an ORM technology - preferably JPA 2. Others are to be considered based on such f...
How to merge YAML arrays?
...
You can merge mappings then convert their keys into a list, under these conditions:
if you are using jinja2 templating and
if item order is not important
some_stuff: &some_stuff
a:
b:
c:
combined_stuff:
<<: *some_stuff
d:
e:
f...
Case objects vs Enumerations in Scala
...ceVal(character: Char, pointValue: Int) extends super.Val()
implicit def convert(value: Value) = value.asInstanceOf[ChessPieceVal]
}
The following items from the enumeration definition are not available (happens to be identical to the list for directly using the Java Enum):
3.1 - It would be...
How to color System.out.println output? [duplicate]
...g inside of the single-quotes). When printf encounters \e or \x1b, it will convert these characters to the ESC character (ASCII: 27). That's just what we want. Now, printf sends ESC31m, and since there is an ESC followed by a valid ANSI escape sequence, we should get colored output (so long as it is...
Why do people say there is modulo bias when using a random number generator?
...
Yuck :-P converting to a double, then multiplying by MAX_UPPER_LIMIT/RAND_MAX is much cleaner and performs better.
– boycy
Jun 13 '12 at 7:59
...
What is the purpose of setting a key in data.table?
...ses to list (i.e., they are equivalent). Internally when i is a list, it's converted to a data.table following which binary search is used to compute row indices. Fixed 1e4 to 1e5 to avoid confusion. Thanks for spotting. Note that we can directly use on= argument now to perform binary subsets rather...
Best explanation for languages without null
...find (_.firstName == "joe")) map (fullNameLength)
How does this work?
//convert an Option[List[Person]] to an Option[S]
//where the function f takes a List[Person] and returns an S
people map f
//find a person named "Joe" in a List[Person].
//returns Some[Person], or None if "Joe" isn't in the l...
Why should we NOT use sys.setdefaultencoding(“utf-8”) in a py script?
...e) changes the default encoding/decoding used whenever Python 2.x needs to convert a Unicode() to a str() (and vice-versa) and the encoding is not given. I.e:
str(u"\u20AC")
unicode("€")
"{}".format(u"\u20AC")
In Python 2.x, the default encoding is set to ASCII and the above examples will fail...
What is the most effective way for float and double comparison?
...er.
Bits bits_; // The bits that represent the number.
};
// Converts an integer from the sign-and-magnitude representation to
// the biased representation. More precisely, let N be 2 to the
// power of (kBitCount - 1), an integer x is represented by the
// unsigned number x + N...