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What's the difference between using INDEX vs KEY in MySQL?
...l necessarily have a key, but having an index is not mandatory.
Check on https://docs.oracle.com/cd/E11882_01/server.112/e40540/indexiot.htm#CNCPT721
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Javascript/DOM: How to remove all events of a DOM object?
...the returned function and create some weird removeAllEvents function:
var _eventHandlers = {}; // somewhere global
const addListener = (node, event, handler, capture = false) => {
if (!(event in _eventHandlers)) {
_eventHandlers[event] = []
}
// here we track the events and their node...
How to find elements by class
...
@pyCthon See answer for @jmunsch, BS now supports class_ which works properly.
– Wernight
Oct 6 '14 at 9:47
30
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Animate text change in UILabel
...^{
self.label.text = rand() % 2 ? @"Nice nice!" : @"Well done!";
} completion:nil];
Swift 3, 4, 5
UIView.transition(with: label,
duration: 0.25,
options: .transitionCrossDissolve,
animations: { [weak self] in
self?.label.text = (arc...
Export from sqlite to csv using shell script
...e able to take the tables from a db file and convert them into csv files.
https://github.com/darrentu/convert-db-to-csv
Feel free to ask me any questions on my script :)
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Image comparison - fast algorithm
...ears to be a good open source implementation of such a hash available at:
http://phash.org/
The main idea is that each image is reduced down to a small hash code or 'fingerprint' by identifying salient features in the original image file and hashing a compact representation of those features (rath...
WordPress asking for my FTP credentials to install plugins
...aemon, or httpd, or apache...) It helped me to see the PHP snippet from a comment below (<?php echo(exec("whoami")); ?>) so that I could tell what user is running the update. Making the change suggested here seemed to simply suppress the FTP credentials challenge so I could see the error mess...
Resetting generator object in Python
...to create a second version of your generator:
y = FunctionWithYield()
y, y_backup = tee(y)
for x in y:
print(x)
for x in y_backup:
print(x)
This could be beneficial from memory usage point of view if the original iteration might not process all the items.
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How does the keyword “use” work in PHP and can I import classes with it?
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191
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Struggling with NSNumberFormatter in Swift for currency
...matter.string(from:) is an optional String not a String (as implied by the comments) so will need unwrapping before use.
– Ali Beadle
Sep 10 '17 at 9:16
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