Each test was performed 5 times and an average time was calculated.
| Optimized | Size | Average time [ms] | Heap size [MB] |
|---|---|---|---|
| ❌ | 10e2 | 0.06158013343811035 | 3.1507919311523436 |
| ❌ | 10e4 | 2.3224000930786133 | 10.012129211425782 |
| ❌ | 10e6 | 246.5065408229828 | 487.14283142089846 |
| ✔️ | 10e2 | 0.05734000205993652 | 2.86851806640625 |
| ✔️ | 10e4 | 0.9794797897338867 | 3.3013275146484373 |
| ✔️ | 10e6 | 33.00432024002075 | 78.09739990234375 |
| const { performance } = require("perf_hooks"); | |
| let factory = process.argv.includes("--optimized") | |
| ? buildStandarizedObject | |
| : buildRandomlyShapedObject; | |
| let size = 10e4; | |
| const sizeOptionPrefix = "--size="; | |
| if (process.argv.find((part) => part.startsWith(sizeOptionPrefix))) { | |
| size = +process.argv | |
| .find((part) => part.startsWith(sizeOptionPrefix)) | |
| .substr(sizeOptionPrefix.length); | |
| } | |
| function getX(obj) { | |
| return obj.x; | |
| } | |
| function buildRandomlyShapedObject(x) { | |
| const obj = {}; | |
| obj[reallyRandom()] = reallyRandom(); | |
| obj.x = x; | |
| obj[reallyRandom()] = reallyRandom(); | |
| return obj; | |
| } | |
| function buildStandarizedObject(x) { | |
| return { foo: reallyRandom(), x }; | |
| } | |
| let lastRandom = 0; | |
| function reallyRandom() { | |
| let random = lastRandom; | |
| do { | |
| random = Math.random(); | |
| } while (random === lastRandom); | |
| lastRandom = random; | |
| return random; | |
| } | |
| console.log(`Building ${size} elements using ${factory.name} function`); | |
| const objs = new Array(size); | |
| for (let i = 0; i < size; i++) { | |
| objs[i] = factory(i); | |
| } | |
| const start = performance.now(); | |
| objs.forEach((obj) => getX(obj)); | |
| const end = performance.now(); | |
| console.log(end - start); | |
| console.log(`Heap used: ${process.memoryUsage().heapUsed / 1024 / 1024} MB`); |