Benchmarkjs

Benchmark.js is a JavaScript benchmarking library. It provides a robust and accurate way to measure the performance of JavaScript code snippets. It supports running benchmarks in the browser, Node.js, and Rhino. The library is designed to handle various measurement challenges, such as the influence of the JavaScript engine's optimizations, asynchronous operations, and statistical sampling.

Benchmark.js uses a suite of tests to determine the optimal number of operations per sample and the number of samples to run for each test. This adaptive approach ensures that benchmarks are run long enough to achieve reliable results without taking an excessive amount of time. It accounts for operations that take very little time, running them multiple times within a single sample to get a measurable duration. For longer operations, it uses fewer repetitions per sample.

The library offers a flexible API for creating and managing benchmark suites. Developers can define test cases, specify the number of times each operation should be executed, and choose the sampling method. The results are presented in a clear and informative way, typically including the number of operations per second, the margin of error, and the number of cycles completed. This allows developers to compare the performance of different code implementations and identify potential bottlenecks. Benchmark.js is widely used in the JavaScript community for performance tuning and validating optimizations.