Run results for: && vs optional chaining

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_8 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/123.0.6312.52 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 123

Operating system: iOS 15.8

Device Platform: Mobile

Date tested: 2 years ago

Benchmark engine: Benchmark.js

optional chaining (?.)

8.1M/s

4.3M/s

View exact numbers

Test name	Executions per second
✓ optional chaining (?.)	8,083,692 Ops/sec
&&	4,251,040 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:

&&
if (job.tags && job.tags.export_id) { // do nothing }
optional chaining (?.)
if (job.tags?.export_id) { // do nothing }

Run results for: && vs optional chaining

How to better null-check

&&

optional chaining (?.)