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(Built-in) way in JavaScript to check if a string is a valid number
... latest version of Chrome. See the performance test here: jsperf.com/isnan-vs-typeof/5
– Kevin Jurkowski
Jan 22 '14 at 0:59
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Check if string matches pattern
...where in string. (See also: https://docs.python.org/library/re.html#search-vs-match)
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How do you build a Singleton in Dart?
...are singleton patterns. It's really a question of syntax "new Singleton()" vs "singleton". I find the latter more clear. Dart's factory constructors are useful, but I don't think this is a good use case for them. I also think Dart's lazy initialisation is a great feature, which is underused. Also re...
Insert Update trigger how to determine if insert or update
...is both a common configuration and a specific action to occur on an INSERT vs. UPDATE trigger. In these cases, to create a separate trigger for the UPDATE and the INSERT would become maintenance problem. (i.e. were both triggers updated properly for the necessary common data algorithm fix?)
To th...
Best way to serialize an NSData into a hexadeximal string
.... I profiled this with a 2MB file on my iPhone 5. Time comparison was 0.05 vs 12 seconds. Memory footprint is negligible with this method while the other method grew the heap to 70MBs!
- (NSString *) hexString
{
NSUInteger bytesCount = self.length;
if (bytesCount) {
const char *hexC...
Difference between `npm start` & `node app.js`, when starting app?
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The documentation has been updated. My answer has substantial changes vs the accepted answer: I wanted to reflect documentation is up-to-date, and accepted answer has a few broken links.
Also, I didn't understand when the accepted answer said "it defaults to node server.js". I think the docume...
What is the convention for word separator in Java package names?
...me and seems more readable for a two word package name like bigdataSource (vs "bigdatasource"). Unless there's some reason camelCase is a bad idea for packages that I'm unaware of, that seems fine.
– Manius
Jun 12 '19 at 16:31
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tomcat - CATALINA_BASE and CATALINA_HOME variables
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CATALINA_HOME vs CATALINA_BASE
If you're running multiple instances, then you need both variables, otherwise only CATALINA_HOME.
In other words: CATALINA_HOME is required and CATALINA_BASE is optional.
CATALINA_HOME represents the root ...
How can I copy the output of a command directly into my clipboard?
... also define alias "cs=xclip -selection clipboard" and alias "vs=xclip -o -selection clipboard" to make copying/pasting from system clipboard easier
– Yibo Yang
Jan 6 '16 at 19:20
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How to lazy load images in ListView in Android
...as an alternative. The two big differences I see are 1) in memory caching vs SD card and 2) the use of AsyncTasks instead of a thread pool. android-developers.blogspot.com/2010/07/…
– Richard
Oct 29 '10 at 20:39
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