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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36

Browser: Chrome 63

Operating system: Mac OS X 10.13.3

Device Platform: Other

Date tested: 2025 years ago

Test name	Executions per second
dot / small object	12162330.0 Ops/sec
bracket / small object	12240280.0 Ops/sec
dot / big object	11310920.0 Ops/sec
bracket / big object	11505070.0 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