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How to update a value, given a key in a hashmap?
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Java 8 way:
You can use computeIfPresent method and supply it a mapping function, which will be called to compute a new value based on existing one.
For example,
Map<String, Integer> words = new HashMap<>();
words.put("hello", 3);
words.put("...
How to set up a cron job to run an executable every hour?
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You're right. && is much better if there is a chance the cd target doesn't exist (for example if the diretory is on an NFS server that happens to be down).
– joast
Aug 13 '10 at 16:36
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Grouping functions (tapply, by, aggregate) and the *apply family
... ?apply). There are enough of them, though, that beginning useRs may have difficulty deciding which one is appropriate for their situation or even remembering them all. They may have a general sense that "I should be using an *apply function here", but it can be tough to keep them all straight at fi...
Get absolute path of initially run script
I have searched high and low and get a lot of different solutions and variables containing info to get the absolute path. But they seem to work under some conditions and not under others. Is there one silver bullet way to get the absolute path of the executed script in PHP? For me, the script wil...
In Perl, how can I read an entire file into a string?
...ted to filehandles in perldoc perlvar and perldoc -f local.
Incidentally, if you can put your script on the server, you can have all the modules you want. See How do I keep my own module/library directory?.
In addition, Path::Class::File allows you to slurp and spew.
Path::Tiny gives even more co...
What is the shortest way to pretty print a org.w3c.dom.Document to stdout?
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But if your XML contains astral characters, and you are using Xalan, note issues.apache.org/jira/browse/XALANJ-2419 and see also stackoverflow.com/a/11987283/1031689
– JasonPlutext
Aug 24 '1...
Looking for a 'cmake clean' command to clear up CMake output
...ke clean.
I usually build the project in a single folder like "build". So if I want to make clean, I can just rm -rf build.
The "build" folder in the same directory as the root "CMakeLists.txt" is usually a good choice. To build your project, you simply give cmake the location of the CMakeLists.tx...
what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
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Following are the three commands which appears same but have minute differences
hadoop fs {args}
hadoop dfs {args}
hdfs dfs {args}
hadoop fs <args>
FS relates to a generic file system which can point to any file systems like local, HDFS etc. So this can be used when you are d...
How do I find the location of my Python site-packages directory?
...s where Python installs your local packages:
python -m site --user-site
If this points to a non-existing directory check the exit status of Python and see python -m site --help for explanations.
Hint: Running pip list --user or pip freeze --user gives you a list of all installed per user site-pa...
Mismatched anonymous define() module
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Like AlienWebguy said, per the docs, require.js can blow up if
You have an anonymous define ("modules that call define() with no string ID") in its own script tag (I assume actually they mean anywhere in global scope)
You have modules that have conflicting names
You use loader plugi...