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What is an invariant?
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It is a condition you know to always be true at a particular place in your logic and can check for when debugging to work out what has gone wrong.
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Spring - @Transactional - What happens in background?
I want to know what actually happens when you annotate a method with @Transactional ?
Of course, I know that Spring will wrap that method in a Transaction.
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How can I find the length of a number?
...ake its absolute value and adjust the sign afterwards.
Update for ES2015
Now that Math.log10 is a thing, you can simply write
const len = Math.ceil(Math.log10(num + 1));
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Which timestamp type should I choose in a PostgreSQL database?
...TE TABLE my_tbl (
my_timestamp TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
CHECK(EXTRACT(TIMEZONE FROM my_timestamp) = '0')
);
test=> SET timezone = 'America/Los_Angeles';
SET
test=> INSERT INTO my_tbl (my_timestamp) VALUES (NOW());
ERROR: new row for relation "my_tbl" violates check...
jQuery checkbox event handling
...ence to the checkbox
if (this.checked) {
// the checkbox is now checked
} else {
// the checkbox is now no longer checked
}
});
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What is memory fragmentation?
...---
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----------------------------------
Now, allocate some of it (5 allocations):
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|aaaabbccccccddeeee |
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Now, free the first four allocations but not the fifth:
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How to post JSON to PHP with curl
... http://localhost:3570/index.php/trainingServer/screencast.json
and see if that helps any.
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How do I find the caller of a method using stacktrace or reflection?
...han the stack trace method.
The following program tests the speed of the different suggested methods (the most interesting bit is in the inner class SecurityManagerMethod):
/**
* Test the speed of various methods for getting the caller class name
*/
public class TestGetCallerClassName {
/**
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Is it possible to group projects in Eclipse?
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Do you know if that option (Top Level Elements -> Working Sets) is available for the PROJECT Explorer view? I don't seem to be able to make it work like in the Package Explorer :(
– Diego
Jan 19 ...
How can I split up a Git commit buried in history?
... tree.
Run git rebase --continue to proceed applying the commits after the now-split commit.
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