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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Browser: Chrome 110

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
dot / small object	17572582.0 Ops/sec
bracket / small object	17141718.0 Ops/sec
dot / big object	15211019.0 Ops/sec
bracket / big object	15707486.0 Ops/sec
bracket variable / small object	8791559.0 Ops/sec
bracket variable / bigobject	7182957.5 Ops/sec
getter/small	7676066.0 Ops/sec
getter /big	7138213.0 Ops/sec

Script Preparation code:

  var key = "prop25";

  // setup a tiny object
  var foo = {
   prop25: "value25"
  };

  function get( obj ){ return obj.prop25; }
  
  // 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'];
bracket variable / small object
var a = foo[key];
bracket variable / bigobject
var a = bigObj[key];
getter/small
var a = get( foo );
getter /big
var a = get( bigObj );

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

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

dot / small object

bracket / small object

dot / big object

bracket / big object

bracket variable / small object

bracket variable / bigobject

getter/small

getter /big