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Is there a Unix utility to prepend timestamps to stdin?
...row this out there: there are a pair of utilities in daemontools called tai64n and tai64nlocal that are made for prepending timestamps to log messages.
Example:
cat file | tai64n | tai64nlocal
IPC performance: Named Pipe vs Socket
...nted a project in C with named pipes, thanks to standart file input-output based communication (fopen, fprintf, fscanf ...) it was so easy and clean (if that is also a consideration).
I even coded them with java (I was serializing and sending objects over them!)
Named pipes has one disadvantage:
...
Integer division with remainder in JavaScript?
...8 millisec
(a-(a%b))/b // -33, 0.6649 millisec
The above is based on 10 million trials for each.
Conclusion: Use (a/b>>0) (or (~~(a/b)) or (a/b|0)) to achieve about 20% gain in efficiency. Also keep in mind that they are all inconsistent with Math.floor, when a/b<0 &&...
Importing CommonCrypto in a Swift framework
...Swift. Also, this article about the same problem with sqlite3 was useful.
Based on the above, the steps are:
1) Create a CommonCrypto directory inside the project directory. Within, create a module.map file. The module map will allow us to use the CommonCrypto library as a module within Swift. Its...
Compile time string hashing
...ace, so you can store it in a std::unordered_map if you need consistency.
Based off of @JerryCoffin's excellent answer and the comment thread below it, but with an attempt to write it with current C++11 best practices (as opposed to anticipating them!).
Note that using a "raw hash" for a switch st...
Disable messages upon loading a package
...e:datasets"
[15] "package:methods" "Autoloads"
[17] "package:base"
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Android Studio - How to increase Allocated Heap Size
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Thx, it's very usefull. FYI, if you use the 64bits version, the file to edit is named studio64.exe.vmoptions.
– Eselfar
Jul 11 '17 at 14:47
add ...
Is there a NumPy function to return the first index of something in an array?
...
Just to add a very performant and handy numba alternative based on np.ndenumerate to find the first index:
from numba import njit
import numpy as np
@njit
def index(array, item):
for idx, val in np.ndenumerate(array):
if val == item:
return idx
# If no ...
Get file size, image width and height before upload
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Example using FileReader API
In case you need images sources as long Base64 encoded data strings
<img src="data:image/png;base64,iVBORw0KGg... ...lF/++TkSuQmCC=">
const EL_browse = document.getElementById('browse');
const EL_preview = document.getElementById('preview');
con...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
...hat in practice stored very short strings.
It's best to define the column based on the type of data that you intend to store. It has benefits to enforce application-related constraints, as other folks have mentioned. But it has the physical benefits to avoid the memory waste I described above.
I...