Performance of ES6 features relative to the ES5 baseline operations per second

Run on 28/09/2022 using babel 7.19.3, babel-runtime 7.19.0 and TypeScript 4.8.4.

For each of the ES6 features in question, a ES5 implementation of that functionality was written along with a ES6 version. It should be noted that the functionality is frequently the same, but in some cases the "common" vs. "correct" version was written, i.e. using x[key] = value vs. defineProperty which is faster but can be hit but a particular nasty edge case for those who deem it fun to extend Object.prototype.

Babel, in both loose+runtime and runtime mode, and Babel were then used to compile the ES6 version to a ES5 compliant version, utilizing the runtime over polyfill to maintain test isolation and avoid native implementations where possible.

All of these test instances were then benchmarked in the given JavaScript engine using Benchmark.js and then the operations per second compared to the ES5 implementation. Cross browser and cross execution comparisions are avoided as much as possible to isolate environmental issues when executing on VMs in the cloud. Identical indicates that the tested implementation was +/- 10% of the ES5 implementation.