Run results for: isNaN vs isInteger

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0

Browser: Firefox 93

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
isNaN	5.1 Ops/sec
isNumber	4.3 Ops/sec

Script Preparation code:

window.case1 = new Proxy({}, {
  get(t, p, r) {
    if (!Number.isNaN(p)) {
      return +p
    }
    else {
      return Reflect.get(t, p, r)
    }
  }
});
window.case2 = new Proxy({}, {
  get(t, p, r) {
    if (Number.isInteger(p)) {
      return +p
    }
    else {
      return Reflect.get(t, p, r)
    }
  }
});
window.gabage1 = 0;
window.gabage2 = 0;

Tests:

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

Run results for: isNaN vs isInteger

isNaN

isNumber