compare object copy
Compare the new ES6 spread operator with the traditional concat() method
Compare performance of native [].findIndex and _.findIndex
This test is to test the return of an array from these loops. A lot of the test are incorrect because .map returns an array. So it will only be fair to test the speeds based on returning a new array from all loops.
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Source code: GitHub/MeasureThat.net
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Based on: Benchmark.js
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Python benchmarks support: Pyodide