Run results for: optional chaining vs. non-optional chaining

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Without optional chaining

23.8M/s

optional chaining (?.) once

23.5M/s

optional chaining (?.) two levels

23.5M/s

View exact numbers

Test name	Executions per second
✓ Without optional chaining	23,771,608 Ops/sec
optional chaining (?.) once	23,529,680 Ops/sec
optional chaining (?.) two levels	23,476,628 Ops/sec

Script Preparation code:

var job = {
  "summary": {
    "total_actions": 4,
    "finished_actions": 4
  },
  "updated_at": "2020-07-15T10:24:42.364000000Z",
  "job_id": "4b1733e7-c8e0-4fdd-a7f1-13d3ab725c92",
  "description": "Job from our export",
  "created_at": "2020-07-15T10:24:40.975000000Z",
  "status": "finished",
  "tags": {
    "export_id": [
      "8848c5d8-fd44-43c0-b7f2-1428d0f4891a" 
    ]
  }
}

Tests:

Without optional chaining
if (job.tags.export_id) { // do nothing }
optional chaining (?.) once
if (job.tags?.export_id) { // do nothing }
optional chaining (?.) two levels
if (job?.tags?.export_id) { // do nothing }

Run results for: optional chaining vs. non-optional chaining

Determine performance cost of using optional chaining when not required

Without optional chaining

optional chaining (?.) once

optional chaining (?.) two levels