Run results for: Jeff's string vs arrays

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 14909.100.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Browser: Chrome 104

Operating system: Chrome OS 14909.100.0

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Array	1.6 Ops/sec
String	218800.7 Ops/sec

Script Preparation code:

function splitGroups({
    howManyPeople,
    maxMembersPerGroup
}) {
    const maxGroups = Math.ceil(howManyPeople / maxMembersPerGroup)
    const minPeoplePerGroup = Math.floor(howManyPeople / maxGroups)
    const peoplePerGroup = Array.from({
        length: maxGroups
    }).fill(
        minPeoplePerGroup
    )
    const remainingPeople = howManyPeople - minPeoplePerGroup * maxGroups
    return peoplePerGroup.map((initialQty, index) => {
        if (index < remainingPeople) return initialQty + 1
        return initialQty
    })
}


const repeat = ({ value, times }) => value.toString().concat(',').repeat(times)
const removeLastChar = (value) => value.slice(0, -1)
function splitGroupsSTR({ howManyPeople, maxMembersPerGroup }) {
    const groups = Math.ceil(howManyPeople / maxMembersPerGroup)

    const minPeoplePerGroup = Math.floor(howManyPeople / groups)
    const groupsWithMorePeople = howManyPeople - minPeoplePerGroup * groups
    const smallerGroups = repeat({
        value: minPeoplePerGroup,
        times: groups - groupsWithMorePeople,
    })
    if (!groupsWithMorePeople) return removeLastChar(smallerGroups)
    const largerGroups = repeat({
        value: minPeoplePerGroup + 1,
        times: groupsWithMorePeople,
    })
    return largerGroups + removeLastChar(smallerGroups)
}

Tests:

Array
splitGroups({howManyPeople: 10000000, maxMembersPerGroup: 3}) splitGroups({howManyPeople: 100, maxMembersPerGroup: 3}) splitGroups({howManyPeople: 10, maxMembersPerGroup: 3})
String
splitGroupsSTR({howManyPeople: 10000000, maxMembersPerGroup: 3}) splitGroupsSTR({howManyPeople: 100, maxMembersPerGroup: 3}) splitGroupsSTR({howManyPeople: 10, maxMembersPerGroup: 3})