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Where does the “flatmap that s***” idiomatic expression in Scala come from?
...t you can replace a lot of tedious if/then/else code you would write with calls to flatMap (and other higher order functions).
This is especially true for Options (see http://tonymorris.github.io/blog/posts/scalaoption-cheat-sheet/)
But it applies to other monads as well (although I have to admit...
Set up a scheduled job?
...Django, and I'm curious if there is a way to schedule a job to run periodically.
24 Answers
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What is null in Java?
... false.
It is also the default value (for variables that have them) for all reference types:
JLS 4.12.5 Initial Values of Variables
Each class variable, instance variable, or array component is initialized with a default value when it is created:
For all reference types, the defa...
java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
...
Add hamcrest-all-X.X.jar to your classpath.
Latest version as of Feb 2015 is 1.3:
http://code.google.com/p/hamcrest/downloads/detail?name=hamcrest-all-1.3.jar&can=2&q=
...
Check whether an array is a subset of another
... @Bul Ikana Working of this code is simple, extension method internally calls the Equals and GetHashCode of the overridden object class methods if there's no IEqualityComparer provided for the job.
– Mrinal Kamboj
Oct 20 '15 at 7:21
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How to prevent Node.js from exiting while waiting for a callback?
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Callback is Not Queued
Node runs until all event queues are empty. A callback is added to an event queue when a call such as
emmiter1.on('this_event',callback).
has executed. This call is part of the code written by th...
Show DialogFragment with animation growing from a point
...:toYDelta="50%"
android:duration="200"
/>
</set>
Finally, the tricky thing here is to get your animation grow from the center of each row. I suppose the row is filling the screen horizontally so, on one hand the android:pivotX value will be static. On the other hand, you can't...
How can I make PHP display the error instead of giving me 500 Internal Server Error [duplicate]
This has never happened before. Usually it displays the error, but now it just gives me a 500 internal server error. Of course before, when it displayed the error, it was different servers. Now I'm on a new server (I have full root, so if I need to configure it somewhere in the php.ini, I can.) Or p...
Using SASS with ASP.NET [closed]
I'm looking into ways to use SASS (Syntactically Awesome StyleSheets) from the Ruby HAML package in an ASP.NET environment. Ideally, I would like compilation of SASS files into CSS to be a seamless part of the build process.
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What exactly does stringstream do?
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To answer the question. stringstream basically allows you to treat a string object like a stream, and use all stream functions and operators on it.
I saw it used mainly for the formatted output/input goodness.
One good example would be c++ implementation of convert...