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When do you use map vs flatMap in RxJava?
...onError handler for you.
Observable.from(jsonFile).map(new Func1<File, String>() {
@Override public String call(File file) {
try {
return new Gson().toJson(new FileReader(file), Object.class);
} catch (FileNotFoundException e) {
// this exception is...
How to determine the current shell I'm working on
...nd that if you do this from within a subshell then it can lead to spurious extra lines by matching the parent's PID as well as the actual shell process. For this, I use -q instead of -p: SHELL=$(ps -ocomm= -q $$)
– Steve
Dec 28 '17 at 23:09
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How do you clear Apache Maven's cache?
...This answer is definitely what I was looking for (option 3) . Here is that extra parameter ::: mvn dependency:purge-local-repository -DmanualInclude="myGroupId" -DsnapshotsOnly=true -DactTransitively=false -DreResolve=false
– granadaCoder
Jan 27 '19 at 12:00
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Retrieving Property name from lambda expression
...berExpression;
if (member == null)
throw new ArgumentException(string.Format(
"Expression '{0}' refers to a method, not a property.",
propertyLambda.ToString()));
PropertyInfo propInfo = member.Member as PropertyInfo;
if (propInfo == null)
throw n...
Converting datetime.date to UTC timestamp in Python
... your code will run under, but it's important to note that the '%s' format string does not exist on all OSes, so this code is not portable. If you want to check whether it's supported you can check man strftime on Unix-like systems.
– Alice Heaton
Feb 4 '16 at ...
How to base64 encode image in linux bash / shell
... cat vlc.jpg | base64 -w 0 - in case someone want output as string to copy and paste.
– user285594
Mar 13 '14 at 10:45
1
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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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public class TestMongoDBShards {
public static void main(String[] args) {
try {
List addresses = new ArrayList();
ServerAddress address1 = new ServerAddress("192.168.0.136" , 20000);
ServerAddress address2 = new...
How do I perform an IF…THEN in an SQL SELECT?
...3053/… for an interesting discussion. I the two links you provide do add extra context, which I support.
– Sam Saffron
Aug 19 '11 at 2:47
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Most efficient way to cast List to List
...return statement, it is apparently fine to use it on an assignment, so the extra "result" variable solves this problem. (It should be optimized away either by the compiler or by the JIT anyway.)
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Ignoring directories in Git repositories on Windows
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or just add an extra . at the end so explorer stops thinking .gitignore is the extension. Then on entry that trailing dot with no extension just gets eaten and you are left with .gitignore TL;DR: try to name it .gitignore. => you end up...