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Applicatives compose, monads don't
What does the above statement mean? And when is one preferable to other?
5 Answers
5
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Why does Apple recommend to use dispatch_once for implementing the singleton pattern under ARC?
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dispatch_once() is absolutely synchronous. Not all GCD methods do things asynchronously (case in point, dispatch_sync() is synchronous). The use of dispatch_once() replaces the following idiom:
+ (MyClass *)sharedInstance {
static MyClass *sharedInstance;
@synchronized(self) {
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Remove unused imports in Android Studio
...Studio, then click on the Optimize Imports that should work.
Update
To do same thing which I described above, you can do same just pressing Ctrl+Alt+O, it will optimize imports of your current file and your entire project depends on your selection in a dialog.
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'AND' vs '&&' as operator
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+1: this should be made loud and clear in PHP documentation, or PHP should change and give same precedence to these operators or DEPRECATE and or once for all. I saw too many people thinking they are exactly the same thing and the answers here are more testimonials.
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sed edit file in place
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at least it does it for me so i don't have to
– amphibient
Oct 2 '12 at 18:47
2
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What is ActiveMQ used for - can we apply messaging concept using a Database?
...tabase ?
There must be some feature that ActiveMQ has that Databases do not?
7 Answers
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How to encode a URL in Swift [duplicate]
...st of unreserved characters:
Characters that are allowed in a URI but do not have a reserved
purpose are called unreserved. These include uppercase and lowercase
letters, decimal digits, hyphen, period, underscore, and tilde.
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"...
What's an elegant way to conditionally add a class to an HTML element in a view?
...ent based on a condition. The problem is I can't figure out a clean way of doing it. Here's an example of the stuff I've tried:
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Is the creation of Java class files deterministic?
...r options to avoid differences? Is a difference only possibly in theory or does Oracle's javac actually produce different class files for the same input and compiler options?
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How to implement my very own URI scheme on Android
...ng the @DanielLew answer, to get the values of the parameteres you have to do this:
URI example: myapp://path/to/what/i/want?keyOne=valueOne&keyTwo=valueTwo
in your activity:
Intent intent = getIntent();
if (Intent.ACTION_VIEW.equals(intent.getAction())) {
Uri uri = intent.getData();
Stri...