Run results for: HashMapLoop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36

Browser: Chrome 83

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Object.values	1245204.0 Ops/sec
for in	1085662.0 Ops/sec
Object.entries	784777.8 Ops/sec
Object.keys	660472.2 Ops/sec
extractAndFilter	1225945.4 Ops/sec
reduce	1393295.8 Ops/sec

Script Preparation code:

var a = {
    1: {
        id: 1
    },
    2: {
        id: 2
    },
    3: {
        id: 3
    }
};

function extractValues(obj) {
    const t = [];
    for (var key in obj) {
        t.push(obj[key]);
    }
    return t;
}

function extractAndFilter(obj) {
    const t = [];
    for (var key in obj) {
        if (obj[key].id > 1) {
            t.push(obj[key].name);
        }
    }
    return t;
}

Tests:

Object.values
Object.values(a).filter(model => model.id > 1).map(model => model.id)
for in
extractValues(a).filter(model => model.id > 1).map(model => model.id)
Object.entries
Object.entries(a).filter(([, model]) => model.id > 1).map(([key]) => key);
Object.keys
Object.keys(a).filter(id => a[id].id > 1).map(id => a[id].id);
extractAndFilter
extractAndFilter(a);
reduce
Object.values(a).reduce((a, b) => { if(b.id > 1) { a.push(b.name); } return a; }, [])

Run results for: HashMapLoop

Object.values

for in

Object.entries

Object.keys

extractAndFilter

reduce