Run results for: isNumber: regex vs isNaN vs string comparison (version: 1) vs parseInt 2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36

Browser: Chrome 96

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
isNaN	583652.6 Ops/sec
regex	568937.0 Ops/sec
string comparison	395710.2 Ops/sec
Number.parseInt	409119.9 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)];
Number.parseInt
gabage4 =+ case4[_.random(0, 1e3, false)];

Run results for: isNumber: regex vs isNaN vs string comparison (version: 1) vs parseInt 2

another attempt

isNaN

regex

string comparison

Number.parseInt