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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...
Difference between JVM and HotSpot?
...t starts by running interpreted, and watches the actual performance of the app. Parts of the app are then selected to be fully-compiled as native code and cached, for much faster execution. HotSpot was developed at Sun as a commercial product. After acquiring Sun, Oracle further evolved HotSpot by c...
Navigation in django
I've just done my first little webapp in django and I love it. I'm about to start on converting an old production PHP site into django and as part its template, there is a navigation bar.
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Adaptive segue in storyboard Xcode 6. Is push deprecated?
... my project I have complicated structure with the sidebar from this lesson appcoda.com/ios-programming-sidebar-navigation-menu and push works, show doesn't. May be the reason is I reuse navigation controller. I've updated my question with the reuse code.
– John Kakon
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Android get current Locale, not default
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The default Locale is constructed statically at runtime for your application process from the system property settings, so it will represent the Locale selected on that device when the application was launched. Typically, this is fine, but it does mean that if the user changes their Local...
Easiest way to rename a model using Django/South?
... pretty straightforward. Run the command:
./manage.py schemamigration yourapp rename_foo_to_bar --empty
(Update 2: try --auto instead of --empty to avoid the warning below. Thanks to @KFB for the tip.)
If you're using an older version of south, you'll need startmigration instead of schemamigrat...
iPhone: Detecting user inactivity/idle time since last screen touch
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Here's the answer I had been looking for:
Have your application delegate subclass UIApplication. In the implementation file, override the sendEvent: method like so:
- (void)sendEvent:(UIEvent *)event {
[super sendEvent:event];
// Only want to reset the timer on a Beg...
nodejs how to read keystrokes from stdin
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It appears that stdin no longer emits a keypress event, but instead emits a data event, with difference parameters.
– skeggse
Aug 2 '12 at 2:28
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VR硬件行业洗牌进行时 70%创业公司倒闭转行做内容 - 资讯 - 清泛网 - 专注C...
...要分发渠道，虽然各个厂商都为自家的产品开发了独立的APP，其实不同的眼镜和APP之间是可以互相兼容的，这便给山寨产品提供了滋生的空间。而与暴风魔镜等知名品牌相比，山寨厂商最大的优势在于成本控制。”
但可以预见...
Java and SQLite [closed]
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The wiki lists some more wrappers:
Java wrapper (around a SWIG interface): http://tk-software.home.comcast.net/
A good tutorial to use JDBC driver for SQLite. (it works at least !) http://www.ci.uchicago.edu/wiki/bin/view/VDS/VDSDevelopment/UsingSQLi...