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Django filter queryset __in for *every* item in list
...One option is, as suggested by jpic and sgallen in the comments, to add .filter() for each category. Each additional filter adds more joins, which should not be a problem for small set of categories.
There is the aggregation approach. This query would be shorter and perhaps quicker for a large set ...
'dragleave' of parent element fires when dragging over children elements
...tructure and I've attached the dragenter and dragleave events to the <div id="dropzone"> element.
22 Answers
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Most efficient way to increment a Map value in Java
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Some test results
I've gotten a lot of good answers to this question--thanks folks--so I decided to run some tests and figure out which method is actually fastest. The five methods I tested are these:
the "ContainsKey" method that I pre...
What is the meaning of “… …” token? i.e. double ellipsis operator on parameter pack
...hat oddity is paired with a case of a regular single ellipsis.
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_impl<_Res(_ArgTypes...)>
{ typedef _Res result_type; };
template<typename _Res, typename... _ArgTypes>
struct _Weak_result_type_i...
HTML5shiv vs Dean Edwards IE7-js vs Modernizr - which to choose?
...tags in IE, like html5shiv.
ie7.js (as well as ie8.js and ie9.js) uses Javascript to retro-fit some missing functionality to IE.
As far as I'm aware there's no cross-over between them (aside from html5shiv/modernizr), so you can use any combination of them, depending on what features you need to i...
Javascript replace with reference to matched group?
...g, such as hello _there_ . I'd like to replace the two underscores with <div> and </div> respectively, using JavaScript . The output would (therefore) look like hello <div>there</div> . The string might contain multiple pairs of underscores.
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Rounding up to next power of 2
...nd-up-power-2.html uint64_t next_pow2(uint64_t x) { return x == 1 ? 1 : 1<<(64-__builtin_clzl(x-1)); } And for 32 bit : uint32_t next_pow2(uint32_t x) { return x == 1 ? 1 : 1<<(32-__builtin_clz(x-1)); } That is if you use GCC (and Clang I think?), but it would be wise to take the time ...
How do you stop tracking a remote branch in Git?
...local branch that is tracking the remote branch:
git branch -d -r origin/<remote branch name>
-r, --remotes tells git to delete the remote-tracking branch (i.e., delete the branch set to track the remote branch). This will not delete the branch on the remote repo!
See "Having a hard time u...
Java String - See if a string contains only numbers and not letters
...g.parseLong vs checking char values.
These ways can produce different result for non-ascii strings and strings containing +/- signs.
Tests run in Throughput mode (greater is better) with 5 warmup iterations and 5 test iterations.
Results
Note that parseLong is almost 100 times slower than isDigi...
Modify file in place (same dest) using Gulp.js and a globbing pattern
...emaps.write('./'))
.pipe(gulp.dest("."));
});
//scripts
gulp.watch([srcPath + '.js','!'+ srcPath + 'min.js']).on("change", function(file) {
console.log("Compiling JS File: " + file.path)
gulp.src(file.path, { base: "./" })
.pipe(uglify())
...