Run results for: Direct Array Access vs. New Local Constant Variable in A Loop v.2

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36

Browser: Chrome 87

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Local Variable Access	1214.3 Ops/sec
Direct Array Access	527.2 Ops/sec

Script Preparation code:

var arr = [
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
    { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" }, { "key": "value" },
]

var newarr1 = []
var newarr2 = []

Tests:

Local Variable Access
for (var i = 0; i < arr.length; i++) { const el = arr[i] for (var j = 0; j < 100; j++) newarr2.push(el) }
Direct Array Access
for (var i = 0; i < arr.length; i++) { for (var j = 0; j < 100; j++) newarr2.push(arr[i]) }

Run results for: Direct Array Access vs. New Local Constant Variable in A Loop v.2

Local Variable Access

Direct Array Access