Run results for: Array.prototype.filter vs filterMap (with map)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Windows

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
Array.prototype.filter	2792.9 Ops/sec
filterMap	2057.3 Ops/sec

Script Preparation code:

var array = [...Array(100000).keys()];

function filterMap(f, n, d) {
    const u = [];
    if (!f) return u;
    if (f.next) {
        let e = 0;
        for (const s of f) n(s, e, f) && u.push(d(s, e, f)), e++;
        return u;
    }
    if (f.entries) {
        for (const [e, s] of f.entries()) n(s, e, f) && u.push(d(s, e, f));
        return u;
    }
    if (typeof f.length != 'undefined') {
        for (let e = 0; e < f.length; e++) {
            const s = f[e];
            n(s, e, f) && u.push(d(s, e, f));
        }
        return u;
    }
    for (const e in f) n(f[e], e, f) && u.push(d(f[e], e, f));
    return u;
}

Tests:

Array.prototype.filter
array.filter(n => n < 10000).map(n => n * 2)
filterMap
filterMap(array, n => n < 10000, n => n * 2)