Run results for: switch on object references

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 28 days ago

Test name	Executions per second
switch on string	16653.9 Ops/sec
switch on object	6268.7 Ops/sec
switch on number	16264.2 Ops/sec

Script Preparation code:

var AAA = {key: "AAA", idx: 0};
var BBB = {key: "BBB", idx: 1};
var CCC = {key: "CCC", idx: 2};
var DDD = {key: "DDD", idx: 3};
var EEE = {key: "EEE", idx: 4};
var arr = [AAA, BBB, CCC, DDD, EEE];
for (let i = 5; i < 1000; i++) {
  arr[i] = arr[i % 5];
}

Tests:

switch on string
var sum = 0; for (let i = 0; i < arr.length; i++) { switch (arr[i].key) { case "AAA": sum += 1; break; case "BBB": sum += 2; break; case "CCC": sum += 3; break; case "DDD": sum += 4; break; case "EEE": sum += 5; break; } }
switch on object
var sum = 0; for (let i = 0; i < arr.length; i++) { switch (arr[i]) { case AAA: sum += 1; break; case BBB: sum += 2; break; case CCC: sum += 3; break; case DDD: sum += 4; break; case EEE: sum += 5; break; } }
switch on number
var sum = 0; for (let i = 0; i < arr.length; i++) { switch (arr[i].idx % 5 | 0) { case 0: sum += 1; break; case 1: sum += 2; break; case 2: sum += 3; break; case 3: sum += 4; break; case 4: sum += 5; break; } }

Run results for: switch on object references

switch on string

switch on object

switch on number