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In Firebase, is there a way to get the number of children of a node without loading all the node dat
... this code tracking upvodes:
var upvotesRef = new Firebase('https://docs-examples.firebaseio.com/android/saving-data/fireblog/posts/-JRHTHaIs-jNPLXOQivY/upvotes');
upvotesRef.transaction(function (current_value) {
return (current_value || 0) + 1;
});
For more info, see https://www.firebase.com/...
How to get UTF-8 working in Java webapps?
...s + JSP, no framework used) to support äöå etc. for regular Finnish text and Cyrillic alphabets like ЦжФ for special cases.
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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
..., the performance hit can be very significant.
– tucuxi
Aug 30 '10 at 10:43
218
@tucuxi I'm surpr...
Is recursion ever faster than looping?
...he language being used. You wrote 'language-agnostic', so I'll give some examples.
In Java, C, and Python, recursion is fairly expensive compared to iteration (in general) because it requires the allocation of a new stack frame. In some C compilers, one can use a compiler flag to eliminate this o...
List of Delphi language features and version in which they were introduced/deprecated
...e to point out that I have honestly and genuinely searched repeatedly and exhaustively via Google for such a thing, and been unable to find one.
...
How do cache lines work?
...d a store-reload has a store-forwarding latency of 4 or 5 cycles on modern x86 CPUs. Things are similar on other architectures.
Further reading: Ulrich Drepper's What Every Programmer Should Know About Memory. The software-prefetch advice is a bit outdated: modern HW prefetchers are smarter, and ...
What is RSS and VSZ in Linux memory management
What are RSS and VSZ in Linux memory management? In a multithreaded environment how can both of these can be managed and tracked?
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How to read a large file - line by line?
...
The with statement handles opening and closing the file, including if an exception is raised in the inner block. The for line in f treats the file object f as an iterable, which automatically uses buffered I/O and memory management so you don't have to worry about large files.
There should be o...
How to pass objects to functions in C++?
I am new to C++ programming, but I have experience in Java. I need guidance on how to pass objects to functions in C++.
7 A...
What would cause an algorithm to have O(log log n) complexity?
...s some of the factors that might cause an algorithm to have O(log n) complexity.
2 Answers
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