Run results for: array vs obj

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
array	952135.9 Ops/sec
object	124880.0 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>

Script Preparation code:

var data1 = [];
for (let i = 0; i < 1000; i++) {
    data1.push({ val1: Math.random() * 100, val2: Math.random() * 100 });
}

var data2 = [];
for (let i = 0; i < 1000; i++) {
    data2.push([ Math.random() * 100, Math.random() * 100 ]);
}


const avgBy = (fn, arr) =>
	arr.reduce((sum, obj) => sum + fn(obj), 0) / arr.length;

Tests:

array
avgBy((obj) => obj[0], data2)
object
avgBy((obj) => obj.val1, data1)

Run results for: array vs obj

array

object