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How is a CRC32 checksum calculated?
... it is extremely difficult to find a polynomial that detects different bit errors effectively.
You can think of the CRC-32 as a series of "Binary Arithmetic with No Carries", or basically "XOR and shift operations". This is technically called Polynomial Arithmetic.
CRC primer, Chapter 5
To bett...
How to convert a factor to integer\numeric without loss of information?
...q max neval
## as.numeric(levels(f))[f] 3.982 5.120 6.088624 5.405 5.974 1981.418 1e+05
## as.numeric(levels(f)[f]) 5.973 7.111 8.352032 7.396 8.250 4256.380 1e+05
## as.numeric(as.character(f)) 6.827 8.249 9.628264 8.534 9.671 1983.694 1e+05
## paste0(x) 7....
Node.js Best Practice Exception Handling
... guide. The following information is more of a summary:
Safely "throwing" errors
Ideally we'd like to avoid uncaught errors as much as possible, as such, instead of literally throwing the error, we can instead safely "throw" the error using one of the following methods depending on our code archit...
Handling warning for possible multiple enumeration of IEnumerable
... need to use an IEnumerable<> several times thus get the Resharper error of "Possible multiple enumeration of IEnumerable ".
...
How to import other Python files?
...ky pie people can't go up and have the sky pie!
SKYCAKE!
If you get an error here: ModuleNotFoundError: No module named 'user' then it means you're using python3, startuphooks are disabled there by default.
Credit for this jist goes to: https://github.com/docwhat/homedir-examples/blob/master/py...
Differences between Emacs and Vim
...om vi to emacs for four reasons: (a) one click to get to the next compiler error, (b) gdb integration, (c) grep and find-grep. Is it possible to do these things in vim now?
– zzz777
May 26 '17 at 17:57
...
node.js global variables?
...allyExit: [Function],
chdir: [Function],
debug: [Function],
error: [Function],
cwd: [Function],
watchFile: [Function],
umask: [Function],
getuid: [Function],
unwatchFile: [Function],
mixin: [Function],
setuid: [Function],
setgid: [Function],
...
MongoDB atomic “findOrCreate”: findOne, insert if nonexistent, but do not update
... ok, thats a good idea, but for the pre-existing value it will return an error but NOT the value itself, right?
– Discipol
May 3 '13 at 14:41
3
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Swift equivalent for MIN and MAX macros
...
If you're getting a fun compiler error in XCode 9 like me, saying that max() doesn't exist even when you clearly pass it two Ints, then change it to Swift.max and suddenly yay, things are better. Thanks wm.p1us!
– xaphod
...
How do you test private methods with NUnit?
... objects with hardcoded behaviour to make it easier to isolate behavioural errors. Rhino.Mocks is a popular free mocking framework which will essentially write the objects for you. TypeMock.NET (a commercial product with a community edition available) is a more powerful framework which can mock CLR ...