Run results for: findIndex update vs for loop update edited 1

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
update via findIndex	21.2 Ops/sec
for loop update	167.6 Ops/sec

Script Preparation code:

var arr = new Array(2000000);
arr.fill({
    id: 0
});
arr = arr.map((el, idx) => el.id = idx);

var findItemIndex = (idToFind, list) => {
    var index = -1
    for (var i = 0; i < list.length; i++) {
        if (list[i].id === idToFind) {
            index = i;
            break;
        }
    }

    return index;
}
var itemsToUpdate = [{
    id: 100,
    updates: {
        name: "111"
    }
}, {
    id: 200,
    updates: {
        name: "111"
    }
}, {

    id: 400,
    updates: {
        name: "111"
    }

}, {
    id: 600,
    updates: {
        name: "111"
    }

}, {
    id: 800,
    updates: {
        name: "111"
    }

}]

Tests:

update via findIndex
itemsToUpdate.forEach((t) => { const storedIndex = arr.findIndex((tD) => { return tD.id === t.id }) if(storedIndex >= 0){ arr[storedIndex] = { ...arr[storedIndex], ...t.updates } } })
for loop update
itemsToUpdate.forEach((t) => { const storedIndex = findItemIndex(t.id, arr) if(storedIndex >= 0){ arr[storedIndex] = { ...arr[storedIndex], ...t.updates } } })

Run results for: findIndex update vs for loop update edited 1

update via findIndex

for loop update