Run results for: isNumber: regex vs isNaN vs custom

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.0.0 Safari/537.36

Browser: Chrome 101

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
isNaN	3.1 Ops/sec
regex	2.8 Ops/sec
custom	2.3 Ops/sec

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 (typeof p === 'number' && !(!(p <= 0) && !(p > 0))) {
            return +p
        } else {
            return Reflect.get(t, p, r)
        }
    }
});
window.gabage1 = 0;
window.gabage2 = 0;
window.gabage3 = 0;

Tests:

isNaN
for (let i = 0; i < 1e6;i++) { gabage1 =+ case1[i]; }
regex
for (let i = 0; i < 1e6;i++) { gabage2 += case2[i]; }
custom
for (let i = 0; i < 1e6;i++) { gabage3 += case3[i]; }

Run results for: isNumber: regex vs isNaN vs custom

judge an object property key is a number

isNaN

regex

custom