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Why does X[Y] join of data.tables not allow a full outer join, or a left join?
...As mnel says, left/right outer join is obtained by swapping Y and X: Y[X] -vs- X[Y]. So 3 of the 4 join types are supported in that syntax, not 2, iiuc.
Adding the 4th seems a good idea. Let's say we add full=TRUE or both=TRUE or merge=TRUE (not sure the best argument name?) then it hadn't occurred...
Lock-free multi-threading is for real threading experts
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community wiki
9 revs, 2 users 97%Andras Vass
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What's the difference between “groups” and “captures” in .NET regular expressions?
...specifically about a .net feature not found in other regex engines (groups vs captures, see title). I don't see anything outdated here, .net is still working the same, in fact this part hasn't changed in a long while in .net. Performance is not part of the question. Yes, non capturing grouping is fa...
Single Page Application: advantages and disadvantages [closed]
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community wiki
7 revs, 3 users 68%Parv Sharma
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List of Big-O for PHP functions
...ating the cost of a function call. This is akin to the $arrray[] = $append vs array_push($array, $append) argument. Second, array_key_exists also differentiates between non-set and null values. For $a = array('fred' => null); array_key_exists('fred', $a) will return true while isset($['fred']) wi...
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
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community wiki
9 revs, 7 users 84%Fabrício Matté
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Why do we need RESTful Web Services?
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community wiki
2 revs, 2 users 51%Rajarajan Pudupatti Sundari J
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Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?
...he only real difference between implementing a power function for integers vs floats.
– numbermaniac
Nov 30 '19 at 14:15
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ab load testing
...e, instead of 1 request at a time, to better simulate concurrent visitors (vs. sequential visitors).
-k sends the KeepAlive header, which asks the web server to not shut down the connection after each request is done, but to instead keep reusing it.
I'm also sending the extra header Accept-Encodin...
How to encrypt String in Java
... all over StackOverflow and online in tutorials and examples.
Nonces and IVs
In response to the issue found with ECB mode nounces also known as IVs were created. The idea is that we generate a new random variable and attach it to every encryption so that when you encrypt two messages that are the ...