Run results for: isNumber: regex vs isNaN vs string comparison (version: 1) vs parseInt

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser: Chrome 109

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
isNaN	1333959.5 Ops/sec
regex	1497774.9 Ops/sec
string comparison	1471547.8 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

window.case1 = new Proxy({}, {
    get(t, p, r) {
        if (typeof p === 'string' && !isNaN(p)) {
            return +p
        } else {
            return Reflect.get(t, p, r)
        }
    }
});
window.case2 = new Proxy({}, {
    get(t, p, r) {
        if (/^\d+$/.test(p)) {
            return +p
        } else {
            return Reflect.get(t, p, r)
        }
    }
});
window.case3 = new Proxy({}, {
    get(t, p, r) {
        if (p >= '0' && p <= '9') {
            return +p
        } else {
            return Reflect.get(t, p, r)
        }
    }
});
window.case4 = new Proxy({}, {
    get(t, p, r) {
        try {
            Number.parseInt(p);
            return +p
        } catch (_) {
            return Reflect.get(t, p, r)
        }
    }
});
window.gabage1 = 0;
window.gabage2 = 0;
window.gabage3 = 0;
window.gabage4 = 0;

Tests:

isNaN
gabage1 =+ case1[_.random(0, 1e3, false)];
regex
gabage2 =+ case2[_.random(0, 1e3, false)];
string comparison
gabage3 =+ case3[_.random(0, 1e3, false)];