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java: ArrayList - how can i check if an index exists?
...also is added in Java 9 to the class List: docs.oracle.com/javase/9/docs/api/java/util/List.html#of--
– Orici
Mar 4 '18 at 19:09
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Ruby / Rails: convert int to time OR get time from integer?
... with the given number of seconds (and optional microseconds) from epoch.
API links
ruby-doc.org/core/classes/Time
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Why do you have to call .items() when iterating over a dictionary in Python?
...te over the same items. Implementation-wise they are different operations (__contains__ vs. __iter__). But that little inconsistency would be somewhat confusing and, well, inconsistent.
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node.js child process - difference between spawn & fork
... node process. You can add listeners for the process you have spawned, to allow your code interact with the spawned process, but no new V8 instance is created(unless of course your command is another Node command, but in this case you should use fork!) and only one copy of your node module is activ...
Length of a JavaScript object
...an break enumerations in various libraries. Adding methods to Object is usually safe, though.
Here's an update as of 2016 and widespread deployment of ES5 and beyond. For IE9+ and all other modern ES5+ capable browsers, you can use Object.keys() so the above code just becomes:
var size = Object...
What is the difference between atomic / volatile / synchronized?
How do atomic / volatile / synchronized work internally?
7 Answers
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python location on mac osx
...e python on osx. I do not know if the previous owner of the laptop has installed macpython using macport. And I remembered that osx has an builtin version of python. I tried using type -a python and the result returned
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Port 80 is being used by SYSTEM (PID 4), what is that?
...P adress is 0.0.0.0, state = LISTENING: means that port 80 is listening to all interfaces (not used)
How to read NETSTAT -AN results:
https://sites.google.com/site/xiangyangsite/home/technical-tips/linux-unix/networks-related-commands-on-linux/how-to-read-netstat--an-results
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Generate Java classes from .XSD files…?
...pendencies in Java 9 by a command line argument, or add the dependency manually.
– Matthias Ronge
Apr 11 '18 at 8:57
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How to debug stream().map(…) with lambda expressions?
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I usually have no problem debugging lambda expressions while using Eclipse or IntelliJ IDEA. Just set a breakpoint and be sure not to inspect the whole lambda expression (inspect only the lambda body).
Another approach is to u...