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Swift Beta performance: sorting arrays
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tl;dr Swift 1.0 is now as fast as C by this benchmark using the default release optimisation level [-O].
Here is an in-place quicksort in Swift Beta:
func quicksort_swift(inout a:CInt[], start:Int, end:Int) {
if (end - start < 2){
return
}
var p = a[start + (end - st...
Git - Undo pushed commits
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You can revert individual commits with:
git revert <commit_hash>
This will create a new commit which reverts the changes of the commit you specified. Note that it only reverts that specific commit, and not commits after that. If you want to revert a range of commits, y...
What is the correct way to represent null XML elements?
....org/TR/REC-xml/#sec-starttags
says that this are the recomended forms.
<test></test>
<test/>
The attribute mentioned in the other answer is validation mechanism and not a representation of state. Please refer to the http://www.w3.org/TR/xmlschema-1/#xsi_nil
XML Schema: Str...
WebDriver: check if an element exists? [duplicate]
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You could alternatively do:
driver.findElements( By.id("...") ).size() != 0
Which saves the nasty try/catch
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Why can't the C# constructor infer type?
...piler fails to make all sorts of possible inferences. For example, class B<T> { public virtual void M<U>() where U : T {} } class D : B<int> { public override void M<U>() {} } ... (new D()).M(); -- you and I can use our mental type inference to know for darn sure that the onl...
C# generic “where constraint” with “any generic type” definition?
...to IGarrage representing the T which should be passed into the IGenericCar<T> constraint:
interface IGarrage<TCar,TOther> where TCar : IGenericCar<TOther> { ... }
Option2: Define a base interface for IGenericCar<T> which is not generic and constrain against that interface
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Accessing localhost:port from Android emulator
...ocalhost and from your Android app you can access it via "http://10.0.2.2:<hostport>".
If your emulator must access the internet through a proxy server, you can configure a custom HTTP proxy from the emulator's Extended controls screen. With the emulator open, click More , and then click Sett...
How to copy file from HDFS to the local file system
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In Hadoop 2.0,
hdfs dfs -copyToLocal <hdfs_input_file_path> <output_path>
where,
hdfs_input_file_path maybe obtained from http://<<name_node_ip>>:50070/explorer.html
output_path is the local path of the file, where the file is to be co...
Programmatically Lighten or Darken a hex color (or rgb, and blend colors)
...s NOT convert to HSL to properly lighten or darken a color. Therefore, results from this function will differ from those much larger and much slower functions that use HSL.
jsFiddle with pSBC
github > pSBC Wiki
Features:
Auto-detects and accepts standard Hex colors in the form of strings. For ...
How to copy Java Collections list
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Calling
List<String> b = new ArrayList<String>(a);
creates a shallow copy of a within b. All elements will exist within b in the exact same order that they were within a (assuming it had an order).
Similarly, calling
// no...