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Logger slf4j advantages of formatting with {} instead of string concatenation
Is there any advantage of using {} instead of string concatenation?
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Grouped LIMIT in PostgreSQL: show the first N rows for each group?
I need to take the first N rows for each group, ordered by custom column.
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Can git automatically switch between spaces and tabs?
I use tabs for indentation in my python programs, but I would like to collaborate (using git) with people who use spaces instead.
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How update the _id of one MongoDB Document?
I want update an _id field of one document. I know it's not a really good pratice. But with some technical reason, I need update it. If I try to update it I get:
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What exactly is Python's file.flush() doing?
I found this in the Python documentation for File Objects :
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B-Tree vs Hash Table
In MySQL, an index type is a b-tree, and access an element in a b-tree is in logarithmic amortized time O(log(n)) .
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Output array to CSV in Ruby
It's easy enough to read a CSV file into an array with Ruby but I can't find any good documentation on how to write an array into a CSV file. Can anyone tell me how to do this?
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How to convert a Git shallow clone to a full clone?
Follow-up of this so-question: if I have a shallow clone, how to fetch all older commits to make it a full clone?
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What is “lifting” in Scala?
Sometimes when I read articles in the Scala ecosystem I read the term "lifting" / "lifted". Unfortunately, it is not explained what that exactly means. I did some research, and it seems that lifting has something to do with functional values or something like that, but I was not able to find a text ...
Chrome: timeouts/interval suspended in background tabs?
I was testing the accuracy of setTimeout using this test . Now I noticed that (as expected) setTimeout is not very accurate but for most appliances not dramatically inaccurate. Now if I run the test in in Chrome and let it run in a background tab (so, switching to another tab and browse on ther...