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How to write a Ruby switch statement (case…when) with regex and backreferences?
...foo.match(re) }
# Do what you will with `m` now.
Declaring m outside the block allows it to still be available after find is done with the block and find will stop as soon as the block returns a true value so you get the same shortcutting behavior that a switch gives you. This gives you the full M...
Semaphore vs. Monitors - what's the difference?
...similar to P and V operations on counting semaphores.
A wait statement can block a process's execution, while a signal statement can cause another process to be unblocked. However, there are some differences between them. When a process executes a P operation, it does not necessarily block that proc...
jquery sortable placeholder height problem
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Are your elements display: block ? Inline elements might make the placeholder not keep the height correctly. Eg. this jsFiddle seems to have a similar problem to the one you described. Adding display: block to the .portlet class fixes it.
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Better to 'try' something and catch the exception or test if it's possible first to avoid an excepti
...dvance, especially when using it on bigger projects.
The code in the try block may have a chance to wreak all sorts of havoc before the exception is caught - if you proactively check beforehand with an if statement you can avoid this.
If the code called in your try block raises a common exception ...
SecurityException: Permission denied (missing INTERNET permission?)
...turing various type of "privacy managers" or similar tools.
So if app is blocked either way, it's basically blocked intentionally by the user and if so, it is really more user problem in this case (or s/he do not understand what certain options/tools really do and what would be the consequences) t...
AtomicInteger lazySet vs. set
... niche
method that is sometimes useful when fine-tuning code using
non-blocking data structures. The semantics are
that the write is guaranteed not to be re-ordered with any
previous write, but may be reordered with subsequent operations
(or equivalently, might not be visible to other thre...
How does the compilation/linking process work?
... the one in Forth work, with no linker.
A linker is something that allows blocks of code to be compiled separately. This can speed up the overall process of building code, and allows some flexibility with how the blocks are later used, in other words they can be relocated in memory, for example ad...
What's the difference between an id and a class?
...cument. For example, you do not necessarily need to add a comment before a block stating that a block of code will contain the main content if the opening tag of the block has an ID of, say, "main", "header", "footer", etc.
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Allow user to set up an SSH tunnel, but nothing else
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On Ubuntu 11.10, I found I could block ssh commands, sent with and without -T, and block scp copying, while allowing port forwarding to go through.
Specifically I have a redis-server on "somehost" bound to localhost:6379 that I wish to share securely via s...
Mapping many-to-many association table with extra column(s)
...USER table is not a pure join table, but has additional functional fields (blocked), you must map it as an entity, and decompose the many to many association between User and Service into two OneToMany associations : One User has many UserServices, and one Service has many UserServices.
You haven't...