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What does ~~ (“double tilde”) do in Javascript?
...o an integer (possibly after coercing the value to a string or a boolean), then inverts the lowest 31 bits. Officially ECMAScript numbers are all floating-point, but some numbers are implemented as 31-bit integers in the SpiderMonkey engine.
You can use it to turn a 1-element array into an integer....
How to monitor network calls made from iOS Simulator
...up. Basically you do:
rvictl -s <iphone-uid-from-xcode-organizer>
Then you sniff the interface it creates with with Wireshark (or your favorite tool), and when you're done shut down the interface with:
rvictl -x <iphone-uid-from-xcode-organizer>
This is nice because if you want to ...
How do I parse a URL into hostname and path in javascript?
...hers.
The first argument is a relative or absolute URL; if it's relative, then you need to specify the second argument (the base URL). For example, for a URL relative to the current page:
new URL("/aa/bb/", location)
In addition to browsers, this API is also available in Node.js since v7, throug...
How do I join two lists in Java?
...the newList's interal array will be initialized to the size of listOne and then have to potentially expand when adding all of the items from listTwo? Would it be better to take the size of each list and use that to size the new array?
– Eric
Mar 2 '16 at 8:38
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When should a class be Comparable and/or Comparator?
...an't do that just by making Person implement Comparable, because you can't then change how two people are compared.
– Jon Skeet
Jun 30 '14 at 11:46
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Using Pairs or 2-tuples in Java [duplicate]
...e your own tuple like this: class Tuple extends AbstractMap.SimpleEntry {} Then you can refer to the class as Tuple.
– yankee
Jun 6 '16 at 9:39
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Why is XOR the default way to combine hashes?
... Sometimes commutativity is a good thing, but xor is a lousy choice even then because all pairs of matching items will get hashed to zero. An arithmetic sum is better; the hash of a pair of matching items will retain only 31 bits of useful data rather than 32, but that's a lot better than retaini...
Why is an int in OCaml only 31 bits?
... maybe access control restrictions or security annotations and so on), and then the actual object data itself. So, a simple integer would be represented as a pointer plus an object consisting of metadata and the actual integer. Even with a very compact representation, that's something like 6 Byte fo...
Limiting floats to two decimal points
... computers are binary, they store floating point numbers as an integer and then divide it by a power of two so 13.95 will be represented in a similar fashion to 125650429603636838/(2**53).
Double precision numbers have 53 bits (16 digits) of precision and regular floats have 24 bits (8 digits) of p...
Streaming video from Android camera to server
...Couldn't load teaonly: findLibrary returned null.. If anyone has solution then please share it. Thanks
– anddev
Mar 19 '12 at 10:04
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