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What is the best way to compare floats for almost-equality in Python?
...ges often give the compiler a lot of slack, so you might not know in which order operations are performed.
There is much more that could be (and is) written about this topic, but I have to stop there. In summary, the answer is: There is no library routine for this comparison because there is no sin...
Oracle: how to UPSERT (update or insert into a table?)
...se uses the undo stack; so Oracle will manage the final state based on the order of when the concurrent transactions started/completed. So, you'll never have a race condition if a constraint check is done before the insert regardless of how many concurrent calls are made to same SQL code. Worst case...
Want to find records with no associated records in Rails
...nd you can also chain this with other Arel methods: Person.without_friends.order("name").limit(10)
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How to build a jar using maven, ignoring test results? [duplicate]
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Use -DskipTests=true instead of -Dmaven.test.skip=true in order to skip tests but compile them.
Using -Dmaven.test.failure.ignore=true will also work but is not very nice.
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Capture Signature using HTML5 and iPad
...es and how well it looks. One note about using it which helped me: add a border to the canvas so you can see how it is being adjusted. Also note that css changes to the canvas do some crazy things, so just specify a height and width in the canvas element if this get out of control.
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Vim search and replace selected text
...in the selection (I'd have to manually process those characters somehow in order for the :s command to work):
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RGB to hex and hex to RGB
...notation, i.e. #rrggbb. Your code is almost correct, except you've got the order reversed. It should be:
var decColor = red * 65536 + green * 256 + blue;
Also, using bit-shifts might make it a bit easier to read:
var decColor = (red << 16) + (green << 8) + blue;
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Creating a temporary directory in Windows?
...he temporary directory name might not be desirable. One could also mix the order with which the time-related fields are combined to make the folder names look more random. I personally prefer to leave it that way simply because it is easier for me to find them all during debugging.
string randomlyG...
Copy a stream to avoid “stream has already been operated upon or closed”
...here the developer is forced to store intermediate results (collecting) in order to process a stream in two different ways. The implication that the stream is generated more than once (unless you collect it) seems clear - because otherwise you wouldn't need a collect method.
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What does “export” do in shell programming? [duplicate]
... '^variable='
$ # No environment variable called variable
$ variable=Hello # Create local (non-exported) variable with value
$ env | grep '^variable='
$ # Still no environment variable called variable
$ export variable ...