Run results for: .dot vs ['bracket'] notation

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36

Browser: Chrome 99

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

bracket / small object

720.2M/s

dot / small object

719.8M/s

dot / big object

107.6M/s

bracket / big object

107.0M/s

View exact numbers

Test name	Executions per second
✓ bracket / small object	720,208,320 Ops/sec
dot / small object	719,773,696 Ops/sec
dot / big object	107,553,152 Ops/sec
bracket / big object	106,988,104 Ops/sec

Script Preparation code:

  // setup a tiny object
  var foo = {
   prop25: "value25"
  };
  
  // setup a really big object
  var bigObj = {};
  for (var i = 0; i < 100000; i++) {
   bigObj["prop" + i] = "value" + i;
  }

Tests:

dot / small object
var a = foo.prop25;
bracket / small object
var a = foo['prop25'];
dot / big object
var a = bigObj.prop25;
bracket / big object
var a = bigObj['prop25'];

Run results for: .dot vs ['bracket'] notation

Fork of https://jsperf.com/dot-vs-square-bracket/5

dot / small object

bracket / small object

dot / big object

bracket / big object