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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 ...
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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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...
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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Select 50 items from list at random to write to file
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If the list is in random order, you can just take the first 50.
Otherwise, use
import random
random.sample(the_list, 50)
random.sample help text:
sample(self, population, k) method of random.Random instance
Chooses k...
image.onload event and browser cache
I want to create an alert box after an image is loaded, but if the image is saved in the browser cache, the .onload event will not be fired.
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Eclipse Android and gitignore
...itory. Also, sometimes I add .classpath and .project which are Eclipse specific files, because maybe I want to create a new Android project based on these same sources, but in another OS or IDE.
With regards to the error, I would clean the project and/or try to run the Fix Project Properties utilit...
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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