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What's the difference between the atomic and nonatomic attributes?
...ead B and C calling the setter with different values, thread A may get any one of the three values returned -- the one prior to any setters being called or either of the values passed into the setters in B and C. Likewise, the object may end up with the value from B or C, no way to tell.
Ensuring ...
Getting parts of a URL (Regex)
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the further parse 'the rest' to be as specific as possible. Doing it in one regex is, well, a bit crazy.
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What is the difference between a string and a byte string?
...f\x81\xce\xbdo\xcf\x82'.decode('utf-8')
'τoρνoς'
Once you know which one to use, you can use the .decode() method of the byte string to get the right character string from it as above. For completeness, the .encode() method of a character string goes the opposite way:
>>> 'τoρνoς...
How do ACID and database transactions work?
...micity means that you can guarantee that all of a transaction happens, or none of it does; you can do complex operations as one single unit, all or nothing, and a crash, power failure, error, or anything else won't allow you to be in a state in which only some of the related changes have happened.
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Incrementing a date in JavaScript
I need to increment a date value by one day in JavaScript.
16 Answers
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Postgresql - change the size of a varchar column to lower length
...e ALTER TABLE command on a really large table (almost 30 millions rows).
One of its columns is a varchar(255) and I would like to resize it to a varchar(40) .
Basically, I would like to change my column by running the following command:
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How to amend a commit without changing commit message (reusing the previous one)?
...lazy, upgrade git and use the built-in command that Shaggle suggests! Plus one for -C option though.
– Dimitris Baltas
Jun 26 '12 at 15:56
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Android: Go back to previous activity
...tp://developer.android.com/reference/android/content/Intent.html
As mentioned in the comments, if the activity is opened with startActivity() then one can close it with finish().
If you wish to use the Up button you can catch that in onOptionsSelected(MenuItem item) method with checking the item I...
What are Scala context and view bounds?
... other words, A should have an implicit conversion to B available, so that one can call B methods on an object of type A. The most common usage of view bounds in the standard library (before Scala 2.8.0, anyway), is with Ordered, like this:
def f[A <% Ordered[A]](a: A, b: A) = if (a < b) a el...
ConcurrentHashMap vs Synchronized HashMap
...re a lock.
Locking the entire collection is a performance overhead. While one thread holds on to the lock, no other thread can use the collection.
ConcurrentHashMap was introduced in JDK 5.
There is no locking at the object level,The locking is at a much finer granularity. For a ConcurrentHashMa...