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When do you use map vs flatMap in RxJava?
...to transform your json to an object, using map should be enough.
Dealing with the FileNotFoundException is another problem (using map or flatmap wouldn't solve this issue).
To solve your Exception problem, just throw it with a Non checked exception : RX will call the onError handler for you.
Obse...
TCP vs UDP on video stream
...eo and UDP for live video, but I thought about this on my way home, and is it necessarily better to use UDP for streaming live video? I mean, if you have the bandwidth for it, and say you are streaming a soccer match, or concert for that matter, do you really need to use UDP?
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What is the difference between String and string in C#?
...an alias in C# for System.String.
So technically, there is no difference. It's like int vs. System.Int32.
As far as guidelines, it's generally recommended to use string any time you're referring to an object.
e.g.
string place = "world";
Likewise, I think it's generally recommended to use Str...
How does the MapReduce sort algorithm work?
...enchmark . I'm having trouble understanding the basics of the sorting algorithm used in the MapReduce environment.
4 Answe...
What do the return values of node.js process.memoryUsage() stand for?
...Code: the actual code being executed
Stack: contains all value types (primitives like integer or Boolean) with pointers referencing objects on the heap and pointers defining the control flow of the program
Heap: a memory segment dedicated to storing reference types like objects, strings and closur...
extract part of a string using bash/cut/split
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To extract joebloggs from this string in bash using parameter expansion without any extra processes...
MYVAR="/var/cpanel/users/joebloggs:DNS9=domain.com"
NAME=${MYVAR%:*} # retain the part before the colon
NAME=${NAME##*/} # retain the part after the last slash
echo $NAME
Doesn't depend on...
Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
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http://wiki.postgresql.org/wiki/Transactional_DDL_in_PostgreSQL:_A_Competitive_Analysis provides an overview of this issue from PostgreSQL's perspective.
Is DDL transactional according to this document?
PostgreSQL - yes
MySQL - no; DDL causes an implicit commit
Oracle Database 11g Release 2 and...
Spring Boot application as a Service
...this recommended approach, or should I convert this app to war and install it into Tomcat?
19 Answers
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Explain the concept of a stack frame in a nutshell
It seems that I get the idea of call stack in programming language design. But I cannot find (probably, I just don't search hard enough) any decent explanation of what stack frame is.
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How do I create a parameterized SQL query? Why Should I?
... using parameterized SQL queries to protect against SQL injection attacks without having to vailidate every piece of user input.
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