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Is there a way to detect if a browser window is not currently active?
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Since originally writing this answer, a new specification has reached recommendation status thanks to the W3C. The Page Visibility API (on MDN) now allows us to more accurately detect when a page is hidden to the user.
document.addEventListener("visibilitychange", onchange);
Current browser ...
Why is there no SortedList in Java?
...nt the natural ordering you can use the constructor parameter that takes a Comparator<T>.
Alternatively, you can use Multisets (also known as Bags), that is a Set that allows duplicate elements, instead and there are third-party implementations of them. Most notably from the Guava libraries t...
Default value of a type at Runtime [duplicate]
...nce is simply null. So, it really is legitimately an actual null reference coming out of e.g. Activator.CreateInstance(typeof(int?)), not an int?. There's probably an int? internally but it disappears during boxing.
– Jonathan Gilbert
Jul 14 '16 at 17:52
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TCP: can two different sockets share a port?
...f the connection. An established connection is uniquely identified by the combination of client-side and server-side IP/Port pairs. Multiple connections on the same server can share the same server-side IP/Port pair as long as they are associated with different client-side IP/Port pairs, and the s...
When are you truly forced to use UUID as part of the design?
...5 and Version 3 UUIDs use the SHA1 and MD5 hash functions respectively, to combine a namespace with a piece of already unique data to generate a UUID. This will, for example, allow you to produce a UUID from a URL. Collisions here are only possible if the underlying hash function also has a collisio...
C++ lambda with captures as a function pointer
...ion has no room for a state." -> How the hell can languages like Java accomplish this then? Well, of course, because that single, global function is created at runtime and embeds the state (or rather the reference to it) in its own code. That is the whole point - there should not be a single, glo...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
... the reason. To extend this result: Intel's Embree project (software.intel.com/en-us/articles/…), uses vectorization for its mathematics. You can download the source at that link and look at how they do their 3/4 D Vectors. Their vector normalization uses rsqrt followed by an iteration of newton-r...
How are parameters sent in an HTTP POST request?
...tipart/form-data encoding instead, which has a different format. It's more complicated, but you usually don't need to care what it looks like, so I won't show an example, but it can be good to know that it exists.
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How to get device make and model on iOS?
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EITHER try this library: http://github.com/erica/uidevice-extension/ (by Erica Sadun). (The library is 7-8 years old, and hence is obsolete)
(Sample Code):
[[UIDevice currentDevice] platformType] // ex: UIDevice4GiPhone
[[UIDevice currentDevice] platfo...
Java lib or app to convert CSV to XML file? [closed]
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