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Best way to convert strings to symbols in hash

What's the (fastest/cleanest/straightforward) way to convert all keys in a hash from strings to symbols in Ruby? 31 Answers...
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ScalaTest in sbt: is there a way to run a single test without tags?

...ldcard, you could specify the full path com.example.specs.YourTestClass.) All tests within that test class will be executed. Presumably you're most concerned with failing tests, so correct any failing implementations and then run: test:testQuick ... which will only execute tests that failed. (Re...
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Gradle build without tests

... Try: gradle assemble To list all available tasks for your project, try: gradle tasks UPDATE: This may not seem the most correct answer at first, but read carefully gradle tasks output or docs. Build tasks ----------- assemble - Assembles the outputs...
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'git status' shows changed files, but 'git diff' doesn't

I've had a look at all similar questions. However, I've double checked and something strange is definitely happening. 13 An...
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How does a Breadth-First Search work when looking for Shortest Path?

I've done some research, and I seem to be missing one small part of this algorithm. I understand how a Breadth-First Search works, but I don't understand how exactly it will get me to a specific path, as opposed to just telling me where each individual node can go. I guess the easiest way to explain...
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pip installing in global site-packages instead of virtualenv

Using pip3 to install a package in a virtualenv causes the package to be installed in the global site-packages folder instead of the one in the virtualenv folder. Here's how I set up Python3 and virtualenv on OS X Mavericks (10.9.1): ...
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General suggestions for debugging in R

...orite debugging routine: When an error occurs, the first thing that I usually do is look at the stack trace by calling traceback(): that shows you where the error occurred, which is especially useful if you have several nested functions. Next I will set options(error=recover); this immediately sw...
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Java Enum definition

...? By making the type argument the new type itself. So if I've got an enum called StatusCode, it would be equivalent to: public class StatusCode extends Enum<StatusCode> Now if you check the constraints, we've got Enum<StatusCode> - so E=StatusCode. Let's check: does E extend Enum<S...
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Is there a difference between copy initialization and direct initialization?

... expression is initialized to (loosely speaking) in C++17. These objects (called "result objects") are the variables created by a declaration (like a1), artificial objects created when the initialization ends up being discarded, or if an object is needed for reference binding (like, in A_factory_fun...
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LaTeX Optional Arguments

.... See the documentation for the other types of optional arguments that are allowed. share | improve this answer | follow | ...