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What is the difference between map and flatMap and a good use case for each?
...ct
res0: Array[String] = Array("Roses are red", "Violets are blue")
Now, map transforms an RDD of length N into another RDD of length N.
For example, it maps from two lines into two line-lengths:
rdd.map(_.length).collect
res1: Array[Int] = Array(13, 16)
But flatMap (loosely speaking...
How to quit scala 2.11.0 REPL?
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Have no windows machine at my disposal right now. @GovindSinghNagarkoti . What works for you ?
– Andreas Neumann
Feb 16 '15 at 9:39
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Trigger change event of dropdown
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I don't know that much JQuery but I've heard it allows to fire native events with this syntax.
$(document).ready(function(){
$('#countrylist').change(function(e){
// Your event handler
});
// And now fire change ...
How to start nginx via different port(other than 80)
...he server, run the command line below;
sudo service nginx start
You may now access your application on port 81 (for localhost, http://localhost:81).
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Make WPF window draggable, no matter what element is clicked
...to exist in WPF, I guess I should make this clearer in the question (right now it's just a tag).
– Alex K
Sep 14 '11 at 14:48
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What is the purpose of std::make_pair vs the constructor of std::pair?
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@Tor Yeah, I know how to use both of them, I was just curious if there was a reason for std::make_pair. Apparently it is just for convenience.
– user542687
Feb 14 '12 at 1:56
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The difference between Classes, Objects, and Instances
...s are created). And it says that, the objects of the class are instances. Now please someone tell me what is the differences between object and instance?Does this mean that object don't really exist in context of programming and instance represents object in it?
– Pranjut
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Singleton pattern in nodejs - is it needed?
...ntly came across this article on how to write a singleton in Node.js. I know the documentation of require states that:
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How do I remove all non alphanumeric characters from a string except dash?
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@BrianScott I know this is old, but was found in a search so I feel this is relevant. This actually depends on the version of .NET you are running under. > 2.0 uses "" & string.Empty exactly the same. stackoverflow.com/questions/151...
Python Requests and persistent sessions
...less than 30 minutes old
lastModification = (datetime.datetime.now() - time).seconds
if lastModification < self.maxSessionTime:
with open(self.sessionFile, "rb") as f:
self.session = pickle.load(f)
wasReadFromCache = ...