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Applicatives compose, monads don't
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If we compare the types
(<*>) :: Applicative a => a (s -> t) -> a s -> a t
(>>=) :: Monad m => m s -> (s -> m t) -> m t
we get a clue to what separates the two concepts. That (s -> m t) in the type of (>>=) show...
java.net.ConnectException: localhost/127.0.0.1:8080 - Connection refused
I am using xampp apache server to serve resources to the application from my machine. But i am getting the above error.
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SHA-1 fingerprint of keystore certificate
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If you're writing Android apps on Xamarin, use this: keytool -list -v -keystore "%USERPROFILE%\AppData\Local\Xamarin\Mono for Android/debug.keystore" -alias androiddebugkey -storepass android -keypass android
– Jay Sidri
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Node / Express: EADDRINUSE, Address already in use - Kill server
...on('SIGTERM', ..)
That being said, SIGTERM (default kill signal) lets the app clean up, while SIGKILL (immediate termination) won't let the app do anything.
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How to print a debug log?
...lso set the value of error_log to 'php://stdout' when debugging a console app and have the error messages appear straight to console, ie: error_log("You messed up!", 3, "php://stdout");
– stefgosselin
May 21 '11 at 12:38
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How to make custom error pages work in ASP.NET MVC 4
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My current setup (on MVC3, but I think it still applies) relies on having an ErrorController, so I use:
<system.web>
<customErrors mode="On" defaultRedirect="~/Error">
<error redirect="~/Error/NotFound" statusCode="404" />
</customErrors...
How to set my default shell on Mac?
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These are applicable to MacOS Sierra 10.12.5 (16F73) and probably some other recent and upcoming versions of MacOS.
chsh is not enough to change the default shell. Make sure you press Command+, while your terminal is open and change ...
How to specify an area name in an action link?
...e a shared master page which I am using from 2 different areas in my mvc 2 app. The master page has an action link which currently specifies the controller and action, but of course the link doesn't work if I'm in the wrong area. I see no overload for actionlink that takes an area parameter, is it...
QString to char* conversion
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Well, the Qt FAQ says:
int main(int argc, char **argv)
{
QApplication app(argc, argv);
QString str1 = "Test";
QByteArray ba = str1.toLocal8Bit();
const char *c_str2 = ba.data();
printf("str2: %s", c_str2);
return app.exec();
}
So perhaps you're having other problems. How...
JSON Array iteration in Android/Java
I am building an android app that needs to download and synchronise with an online database, I am sending my query from the app to a php page which returns the relevant rows from a database in JSON format.
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