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Best way to merge two maps and sum the values of same key?
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The shortest answer I know of that uses only the standard library is
map1 ++ map2.map{ case (k,v) => k -> (v + map1.getOrElse(k,0)) }
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How do I disable orientation change on Android?
...in 2009 when I first answered the question and it really isn't a good idea now. See this answer by hackbod for reasons:
Avoid reloading activity with asynctask on orientation change in android
Add android:configChanges="keyboardHidden|orientation" to your AndroidManifest.xml. This tells the syste...
How to clear basic authentication details in chrome
... basic authentication. Using Chrome I've logged in using the basic auth. I now want to remove the basic authentication details from the browser and try a different login.
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How can I sanitize user input with PHP?
...'s a common misconception that user input can be filtered. PHP even has a (now deprecated) "feature", called magic-quotes, that builds on this idea. It's nonsense. Forget about filtering (or cleaning, or whatever people call it).
What you should do, to avoid problems, is quite simple: whenever you ...
What are free monads?
I've seen the term Free Monad pop up every now and then for some time, but everyone just seems to use/discuss them without giving an explanation of what they are. So: what are free monads? (I'd say I'm familiar with monads and the Haskell basics, but have only a very rough knowledge of cat...
How do shift operators work in Java? [duplicate]
...00000000000
System.out.println(Integer.toBinaryString(2 << 33));
Now, int is of 4 bytes,hence 32 bits. So when you do shift by 33, it's equivalent to shift by 1. Hence : 100
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Eclipse: How do i refresh an entire workspace? F5 doesn't do it
...t it's no longer highlighted (but the P. Explorer still has focus)
F5 will now Refresh the entire workspace
Effectively F5 refreshes the Workspace when a navigation view has focus and nothing is selected.
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How do you fork your own repository on GitHub?
...new project based on this repository, but I don't want to affect how it is now. I tried forking it using the GitHub UI but it didn't do anything.
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How to send an email with Gmail as provider using Python?
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As of August 2014 this now raises smtplib.SMTPAuthenticationError: (534, '5.7.9 Application-specific password required.
– anon58192932
Aug 27 '14 at 18:06
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JPA: what is the proper pattern for iterating over large result sets?
...e've just migrated from JBoss 4.x to JBoss 5.1, so we've stuck with it for now, and thus the latest Hibernate we can use is 3.3.2.
Adding couple of extra parameters did the job, and code like this runs without OOMEs:
StatelessSession session = ((Session) entityManager.getDelegate()).getSes...