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Why is string concatenation faster than array join?
...tenation:
// ECMA-262, section 15.5.4.6
function StringConcat() {
if (IS_NULL_OR_UNDEFINED(this) && !IS_UNDETECTABLE(this)) {
throw MakeTypeError("called_on_null_or_undefined", ["String.prototype.concat"]);
}
var len = %_ArgumentsLength();
var this_as_string = TO_STRING_INLINE(t...
Can't start Eclipse - Java was started but returned exit code=13
... answered Jan 3 '17 at 10:54
tk_tk_
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...
“for line in…” results in UnicodeDecodeError: 'utf-8' codec can't decode byte
...rb').read())['encoding']. Check out this answer for details: stackoverflow.com/a/3323810/615422
– VertigoRay
Mar 20 '19 at 13:34
...
Generate random numbers with a given (numerical) distribution
...
scipy.stats.rv_discrete might be what you want. You can supply your probabilities via the values parameter. You can then use the rvs() method of the distribution object to generate random numbers.
As pointed out by Eugene Pakhomov in th...
扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...ction() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?8d287b854d737bdc880e8ddeac1b309d"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })();
扩展App I...
How do I compare two strings in Perl?
...fied by the current locale if a legacy use locale (but not use locale ':not_characters') is in effect. See perllocale. Do not mix these with Unicode, only with legacy binary encodings. The standard Unicode::Collate and Unicode::Collate::Locale modules offer much more powerful solutions to collation ...
C++ templates Turing-complete?
...
To give a non-trivial example: http://gitorious.org/metatrace , a C++ compile time ray tracer.
Note that C++0x will add a non-template, compile-time, turing-complete facility in form of constexpr:
constexpr unsigned int fac (unsigned int u) {
ret...
What's wrong with nullable columns in composite primary keys?
...key creation. If this was just a retrieval problem, you could use where pk_1 = 'a' and pk_2 = 'b' with normal values, and switch to where pk_1 is null and pk_2 = 'b' when there are nulls.
– EoghanM
Mar 15 '13 at 9:59
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Why can't I define a static method in a Java interface?
...proposal to add them in Java 7, but it was later dropped due to unforeseen complications.
Finally, Java 8 introduced static interface methods, as well as override-able instance methods with a default implementation. They still can't have instance fields though. These features are part of the lambda...
Create Generic method constraining T to an Enum
...or F#), but is possible in MSIL. I wrote this little....thing
// license: http://www.apache.org/licenses/LICENSE-2.0.html
.assembly MyThing{}
.class public abstract sealed MyThing.Thing
extends [mscorlib]System.Object
{
.method public static !!T GetEnumFromString<valuetype .ctor ([msco...