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Why use symbols as hash keys in Ruby?
...ys only, Ruby will use a frozen copy instead of the object itself.
2) The letters "b", "a", and "r" are stored only once for all occurrences of :bar in a program. Before Ruby 2.2, it was a bad idea to constantly create new Symbols that were never reused, as they would remain in the global Symbol lo...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
... they deliver all those packages if they don't know the difference between letters and numbers.
And so on...
Take the time to think about your data and its limits. If you're a architect, developer, or programmer, it's your job, after all.
By using a varchar(n) instead of varchar(255) you elimina...
Explain which gitignore rule is ignoring my file
...'^(S|[[:lower:]])' # S means update-index --skip-worktree, and lower first letter means --assume-unchanged."
The comment and final " are part of the line to be copied to your .gitconfig.
Usage:
git ignore file1 file2 file3
...
best practice to generate random token for forgot password
...t's really a matter of preference. I prefer to do all crypto operations on raw binary and only ever convert to hex/base64 for transmission or storage.
– Scott Arciszewski
Dec 18 '15 at 18:56
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What's the difference between the atomic and nonatomic attributes?
... answered May 25 '12 at 10:56
raw3draw3d
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performSelector may cause a leak because its selector is unknown
.... In Objective-C, developers are able to do this by using C style casts on raw function pointers.
With the introduction of Swift, Apple has documented the performSelector: family of methods as "inherently unsafe" and they are not available to Swift.
Over time, we have seen this progression:
Earl...
Best approach to real time http streaming to HTML5 video client
...ith that). MP4 is broken into two pieces: moov and mdat. mdat contains the raw audio video data. But it is not indexed, so without the moov, it is useless. The moov contains an index of all data in the mdat. But due to its format, it can not be 'flattened' until the timestamps and size of EVERY fram...
When should we use mutex and when should we use semaphore
... Unlock
Aside: in case you've ever wondered at the bizarre letters used for claiming and releasing semaphores, it's because the inventor was Dutch. Probeer te verlagen means to try and decrease while verhogen means to increase.
(a) ... or it can be thought of as something totally ...
Are global variables bad? [closed]
...iables for a particular sub-system all beginning with the same first three letters (see this on resolving name space collisions in objective C). C++ provides namespaces and with C you can work around this by creating a globally visible struct whose members are various data items and pointers to dat...
Improving bulk insert performance in Entity framework [duplicate]
...sing custom stored procedure accepting table valued parameter but you need raw ADO.NET for that.
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