Run results for: get object vs array key

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36

Browser: Chrome 85

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
array	14.1 Ops/sec
object	11.7 Ops/sec
object with text field	1.9 Ops/sec

Script Preparation code:

var array = []
var object1 = {}
var object2 = {}

for(var i = 0; i < 1e6; i++) {
    var v = Math.random()
    array[i] = v
    object1[i] = v
    object2[`v${i}`] = v
}

Tests:

array
var sum = 0 for(var i = 1e6 - 1; i >= 0; i--) { sum += array[i] } sum
object
var sum = 0 for(var i = 1e6 - 1; i >= 0; i--) { sum += object1[i] } sum
object with text field
var sum = 0 for(var i = 1e6 - 1; i >= 0; i--) { sum += object2[`v${i}`] } sum

Run results for: get object vs array key

array

object

object with text field