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What does “var FOO = FOO || {}” (assign a variable or an empty object to that variable) mean in Java

...} both of which share the same namespace it then doesn't matter in which order the two files are loaded, you still get func1 and func2 correctly defined within the MY_NAMESPACE object correctly. The first file loaded will create the initial MY_NAMESPACE object, and any subsequently loaded file wi...
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Downloading Java JDK on Linux via wget is shown license page instead

...e.com/otn-pub/java/jdk/14.0.1+7/664493ef4a6946b186ff29eb326336a2/jdk-14.0.1_linux-x64_bin.rpm -O ~/Downloads/jdk-14.0.1_linux-x64_bin.rpm PS: Alf added this ( me ) :-) this, I couldn't figured out how to just commented at the end... Enjoy it. UPDATED FOR Oracle JDK 11 wget --no-check-certificate -c...
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How to manage REST API versioning with spring?

...before using the default RequestMappingHandlerMapping (e.g. by setting its order to 0). This wouldn't require any hacky replacements of Spring components but uses the Spring configuration and extension mechanisms so it should work even if you update your Spring version (as long as the new version ...
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How do you create nested dict in Python?

...he following: d = {} # can use defaultdict(dict) instead for row in file_map: # derive row key from something # when using defaultdict, we can skip the next step creating a dictionary on row_key d[row_key] = {} for idx, col in enumerate(row): d[row_key][idx] = col Ac...
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Why does base64 encoding require padding if the input length is not divisible by 3?

...ally it seems you can't, for example the implementations in javascript and php don't support this. Starting with a concatenated string, you either have to decode 4 bytes at a time or split the string after padding characters. It seems like those implementations just ignore the padding chars, even wh...
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Can someone explain in simple terms to me what a directed acyclic graph is?

...Hence B depends on A or in better terms A has an edge directed to B. So in order to reach Node B you have to visit Node A. It will soon be clear that after adding all the subjects with its pre-requisites into a graph, it will turn out to be a Directed Acyclic Graph. If there was a cycle then yo...
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ElasticSearch: Unassigned Shards, how to fix?

...enable shard allocation. # v0.90.x and earlier curl -XPUT 'localhost:9200/_settings' -d '{ "index.routing.allocation.disable_allocation": false }' # v1.0+ curl -XPUT 'localhost:9200/_cluster/settings' -d '{ "transient" : { "cluster.routing.allocation.enable" : "all" } }' Elas...
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machine learning libraries in C# [closed]

...asses: public class TrainingSet { private readonly List<string> _attributes = new List<string>(); private readonly List<List<object>> _examples = new List<List<object>>(); public TrainingSet(params string[] attributes) { _attributes.AddRang...
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Rename multiple files by replacing a particular pattern in the filenames using a shell script [dupli

...a pattern. For example following command will prepend string MyVacation2011_ to all the files with jpg extension. rename 's/^/MyVacation2011_/g' *.jpg or rename <pattern> <replacement> <file-list> sha...
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Converting a Java collection into a Scala collection

... but you can also avoid using jcl.Buffer: Set(javaApi.query(...).toArray: _*) Note that scala.collection.immutable.Set is made available by default thanks to Predef.scala. share | improve this an...