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Proper use of beginBackgroundTaskWithExpirationHandler
...l need to wrap it in a background task. It's also very important that you call endBackgroundTask when you're finished - otherwise the app will be killed after its allotted time has expired.
Mine tend look something like this:
- (void) doUpdate
{
dispatch_async(dispatch_get_global_queue(DISPAT...
Event system in Python
...r methods', which is a
simple implementation of the Observer pattern.
Basically, the handler methods (callables) are stored in an array and are each called when the event 'fires'.
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The disadvantage of Observer event systems is that you can only register the handlers on the actual Ev...
Exit a Script On Error
... If you like the ABS, you'll love the BashGuide, BashFAQ and BashPitfalls.
– Paused until further notice.
Dec 8 '10 at 4:45
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Why use softmax as opposed to standard normalization?
...harper image? This is simply a matter of scaling and both cases are essentially the same. If anything, this should seem to support standard normalization, which correctly considers the two cases equivalent.
– user118967
Jun 5 '19 at 5:07
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How do I make a fully statically linked .exe with Visual Studio Express 2005?
...g any other libraries you may need to tell the linker to ignore the dynamically linked CRT explicitly.
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What causes imported Maven project in Eclipse to use Java 1.5 instead of Java 1.6 by default and how
... I have 1.6 configured as my Eclipse default Preferences->Java->Installed JREs .
12 Answers
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New Array from Index Range Swift
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Pedantic point, but this isn't really casting the Slice to an Array, but rather creating a new array from a slice. A cast would use the as operator: numbers as Array which would result in an error.
– j b
Jun 10 '14 at 9...
Replace a value if null or undefined in JavaScript
... boolean value but the first value that can be converted to true.
Additionally use an array of objects instead of one single object:
var options = {
filters: [
{
name: 'firstName',
value: 'abc'
}
]
};
var filter = options.filters[0] || ''; // is {n...
How can I hash a password in Java?
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You can actually use a facility built in to the Java runtime to do this. The SunJCE in Java 6 supports PBKDF2, which is a good algorithm to use for password hashing.
byte[] salt = new byte[16];
random.nextBytes(salt);
KeySpec spec = new...
How to use ScrollView in Android?
...een is not an issue; the parent layout simply needs to be arranged so they all have room on the screen. As for one ScrollView inside another, that's difficult. Instead, the Android compatibility library has NestedScrollView. There are lots of tutorials on the web for how to use NestedScrollView for ...