performance

[Solved] Performance: While-loop

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I would suggest neither, rather I would suggest this List<int> data = Enumerable.Range(0, 10000000).ToList(); int j = -1; // Method 1 while (++j < data.Count) { // do something } int j = 0; do { //anything } while (++j<data.count); pre-increment operation is faster than post, although a small performance advantage 3 solved Performance: While-loop

[Solved] Create Hashset with a large number of elements (1M)

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To build on @Enigmativity’s answer, here’s a proper benchmark using BenchmarkDotNet: public class Benchmark { private const int N = 1000000; [Benchmark] public HashSet<int> EnumerableRange() => new HashSet<int>(Enumerable.Range(1, N + 1)); [Benchmark] public HashSet<int> NoPreallocation() { var result = new HashSet<int>(); for (int n = 1; n < N + 1; n++) { result.Add(n); } … Read more

[Solved] High-performance merging of ordered sets

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This is not going to be the fastest data structure & algorithm for your particular purpose I guess, but it may be fast enough. Test it yourself. Note that a std::forward_list or even a std::vector might be faster depending on the actual scenario (-> constant factors in big-O-notation). tmyklebu mentioned another approach in the comments: … Read more

[Solved] Convert JSON to array in Javascript

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You could splice the values and get only the first two elements as number. var array = [{ time: “18:00:00” }, { time: “10:00:00″ }, { time:”16:30:00” }], result = array.map(o => o.time.split(‘:’).slice(0, 2).map(Number)); console.log(result); .as-console-wrapper { max-height: 100% !important; top: 0; } If you have JSON sting, then you need to parse it with … Read more

[Solved] When i tried to add the library it gives an error of versions .. help me to solve it please [closed]

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this is not an error in fact. It is a warning telling that you are using one version of android support library (26.1.0), and your library is using another version (27.0.2) To solve this warning you should use version 27.0.2 too. But it might be not required. You may try building the app as it … Read more

[Solved] Performance of java if-else with return statement [duplicate]

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As far as cpu time – NO DIFFERENCE. The compiler will probably optimise them to exactly the same byte-code anyway. As far as technical debt is concerned – as soon as a real developer looks at this code and replaces it with: private static final String[] numbers = {“ZERO”, “ONE”, “TWO”}; private String getString(int n) … Read more

[Solved] Switch vs dictionary with double keys

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Your business logic is a bit unclear, but in regards to the Dictionary object initialization/performance issue, the solution below may serve as a valid alternative. Pertinent to your use-case, you can declare Dictionary<double, int> as shown in the following sample C# code snippet: public static Dictionary<double, int> SampleDictionary =new Dictionary<double, int> { { 3.1, 3}, … Read more

[Solved] My website is really slow, how to make it faster [closed]

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Your problem is the external load of JS and CSS( kaspersky ). Comment or remove this lines of your code: <script type=”text/javascript” src=”https://gc.kis.v2.scr.kaspersky-labs.com/859509E7-F570-4047-AEC0-CEF2BFA49B1B/main.js” charset=”UTF-8″></script> <link rel=”stylesheet” crossorigin=”anonymous” href=”https://gc.kis.v2.scr.kaspersky-labs.com/B1B94AFB2FEC-0CEA-7404-075F-7E905958/abn/main.css”/> 0 solved My website is really slow, how to make it faster [closed]

[Solved] fastest way to compare string elements with each other

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The amount of downvotes is crazy but oh well… I found the reason for my performance issue / bottleneck thanks to the comments. The second for loop inside StartSimilarityCheck() iterates over all entries, which in itself is no problem but when viewed under performance issues and efficient, is bad. The solution is to only check … Read more

[Solved] if-else vs if performance

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There is no performance difference since the generated code is exactly the same: $ echo “int main() { int number; if (number == 0) return -1; return 0; }” | g++ -x c++ -S – -o /dev/stdout | md5sum 9430c430d1f748cc920af36420d160ce – $ echo “int main() { int number; if (number == 0) return -1; else … Read more

[Solved] make application with database MySQL is faster [closed]

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For db Add indexes for frequently searched fields Think about table partitioning, rarely searched data should be stored in archive tables For backend Optimize queries Minimize cursor fetching For client Use pagination to avoid large data loading Use async loading (SwingWorker for swing, Service for javafx) to avoid UI hanging Don’t mix archive and working … Read more

[Solved] for Loop commands – which is faster?

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To keep it simple, in case A, your program has to initialize i only once. Assign values to i only array.Length times. Increase i values only array.Length times. do the line execution and comparison 2*array.Length times. In case B, initialize i twice. Assign values to i 2*array.Length times. Increase i values 2*array.Length times. do line … Read more