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Merging: Hg/Git vs. SVN
...OT BETTER at merging than SVN. This is obviously anecdotal, but there is a table to follow.
Here are some of the things we found:
SVN used to throw up a lot of tree conflicts in situations where it seemed like it shouldn't. We never got to the bottom of this but it doesn't happen in GIT.
While be...
How to combine two or more querysets in a Django view?
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If merging querysets from the same table to perform an OR query, and have duplicated rows you can eliminate them with the groupby function: from itertools import groupby unique_results = [rows.next() for (key, rows) in groupby(result_list, key=lambda obj: obj...
How do I compare strings in Java?
..." String objects to save memory footprint as String is known for being immutable (I hope, I say it correctly here). Also check stackoverflow.com/questions/3052442/…
– Roland
Nov 10 '17 at 13:34
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In C++, is it still bad practice to return a vector from a function?
... as vectors/arrays—in many programming languages. Is this style now acceptable in C++0x if the class has a move constructor, or do C++ programmers consider it weird/ugly/abomination?
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Determine a user's timezone
...e is running.
Supported environments are listed in the Intl compatibility table. Expand the DateTimeFormat section, and look at the feature named resolvedOptions().timeZone defaults to the host environment.
Some libraries, such as Luxon use this API to determine the time zone through functions li...
Benchmarking (python vs. c++ using BLAS) and (numpy)
... new machines I also ran the benchmark for matrix sizes 5000 and 8000.
The table below includes the benchmark results from the original answer (renamed: MKL --> Nehalem MKL, Netlib Blas --> Nehalem Netlib BLAS, etc)
Single threaded performance:
Multi threaded performance (8 threads):
T...
How does Windows 8 Runtime (WinRT / Windows Store apps / Windows 10 Universal App) compare to Silver
...vent) rather than the old COM model of event sources and sinks. Of other notable things, WinRT also has parametrized ("generic") interfaces.
One other big change is that all WinRT components have metadata available for them, just like .NET assemblies. In COM you kinda sorta had that with typelibs, ...
How can I merge properties of two JavaScript objects dynamically?
...ties versus just copying or defining new properties. This may make it unsuitable for merging new properties into a prototype if the merge sources contain getters." (developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…). I had to use var merged = {...obj1, ...obj2}.
– m...
Why is an int in OCaml only 31 bits?
...you take up almost 20 Byte.
However, the trick is that with so-called immutable value types like integers, you usually don't need all the metadata in the object header: you can just leave all that stuff out, and simply synthesize it (which is VM-nerd-speak for "fake it"), when anyone cares to look....
What are the differences between a HashMap and a Hashtable in Java?
What are the differences between a HashMap and a Hashtable in Java?
35 Answers
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