for-in for-in hasOwnProperty object.keys forEach
Compares slice, substr and substring to each other when there is only a start index
judge an object property key is a number
Ripped off from another user but fixed a bug in "spread"
bytymighty
Compare different ways to search objects in an array given its id.
Test on isEqual performance
Test
!!x vs Boolean(x)
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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