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How to get the first element of an array?
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How to create index on JSON field in Postgres?
...w do I create an index on a JSON field? I tried it using the -> operator used for hstore but got the following error:
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How to get the current date without the time?
... a DateTime using the Today property:
DateTime today = DateTime.Today;
or more generally, you can use the Date property. For example, if you wanted the UTC date you could use:
DateTime dateTime = DateTime.UtcNow.Date;
It's not very clear whether that's what you need or not though... if you'r...
Git submodule push
If I modify a submodule, can I push the commit back to the submodule origin, or would that require a clone?
If clone, can I store a clone inside another repository?
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Scala list concatenation, ::: vs ++
Is there any difference between ::: and ++ for concatenating lists in Scala?
4 Answers
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How to get Maven project version to the bash command line
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The Maven Help Plugin is somehow already proposing something for this:
help:evaluate evaluates Maven expressions given by the user in an interactive mode.
Here is how you would invoke it on the command line to get the ${project.version}:
mvn org.apache.maven.plugins:maven-h...
Remove data.frame row names when using xtable
...tight (read: "stupid"), and I assume it's quite easy too. I'm writing a report and I want to use xtable package for LaTeX table generation (note that memisc package does the job, but say I want to do this solely with xtable ).
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Getting a structural type with an anonymous class's methods from a macro
...nt to write a macro that defines an anonymous class with some type members or methods, and then creates an instance of that class that's statically typed as a structural type with those methods, etc. This is possible with the macro system in 2.10.0, and the type member part is extremely easy:
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lenses, fclabels, data-accessor - which library for structure access and mutation is better
There are at least three popular libraries for accessing and manipulating fields of records. The ones I know of are: data-accessor, fclabels and lenses.
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How to increase the maximum number of opened editors in IntelliJ?
...ilding a grails-app with IntelliJ 9.0 and I am a huge fan of the CTR+TAB shortcut that switches between active editors.
2 A...