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difference between foldLeft and reduceLeft in Scala
...eft will error if applied to an empty container with the following error.
java.lang.UnsupportedOperationException: empty.reduceLeft
Reworking the code to use
myList foldLeft(List[String]()) {(a,b) => a+b}
is one potential option. Another is to use the reduceLeftOption variant which return...
Why do enum permissions often have 0, 1, 2, 4 values?
...f constant-folding works in C# but it works just fine in C/C++ (as well as Java, I think).
– fluffy
Mar 22 '12 at 4:18
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Android Studio: Add jar as library?
...braries.
4.3. Click the + sign above the panel second from the left -> Java
4.4. Select your local jar and add it to the project.
You may need to run the above ./gradlew command one more time
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How do I use reflection to invoke a private method?
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Reflection dangerous? Hmmm... C# , Java, Python... actually everything is dangerous, even the world :D You just have to take care about how to do it safely...
– Legends
Feb 1 '18 at 12:19
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Distributed sequence number generation?
...Hazelcast. In it's 1.9 release it includes a Distributed implementation of java.util.concurrent.AtomicLong
You can also use Zookeeper. It provides methods for creating sequence nodes (appended to znode names, though I prefer using version numbers of the nodes). Be careful with this one though: if yo...
MySQL, Check if a column exists in a table with SQL
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The question is not how to do that using php + sql or java + sql, it's how to do that using pure sql / mysql hence the downvote
– Yuriy Nakonechnyy
Jun 18 '12 at 9:54
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Remove the error indicator from a previously-validated EditText widget
...is extension function
fun EditText.clearError() {
error = null
}
In Java:
editText.setError(null);
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How can I use a C++ library from node.js?
...fi is a Node.js addon for loading and calling dynamic libraries using pure JavaScript. It can be used to create bindings to native libraries without writing any C++ code.
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Learning Regular Expressions [closed]
... however you like.
Tools for writing and debugging regexes:
RegExr (for JavaScript)
Perl: YAPE: Regex Explain
Regex Coach (engine backed by CL-PPCRE)
RegexPal (for JavaScript)
Regular Expressions Online Tester
Regex Buddy
Regex 101 (for PCRE, JavaScript, Python, Golang)
Visual RegExp
Expresso (f...
Application Loader stuck at “Authenticating with the iTunes store” when uploading an iOS app
...NCLUTION:
Either the old Application Loader, or the latest Xcode, uses a Java program iTMSTransporter to process the ipa file uploading.
To function correctly, iTMSTransporter requires a set of jar files downloaded from Internet and cached in your local folder.
If your cache is somehow broken, or ...