Run results for: .prototype.isPrototypeOf vs .prototype.isPrototypeOf.bind vs Object.prototype.toString.call vs shorthand for Object.prototype.toString

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

.prototype.isPrototypeOf.bind

1.3M/s

.prototype.isPrototypeOf

910K/s

Object.prototype.toString.call

258K/s

View exact numbers

Test name	Executions per second
✓ .prototype.isPrototypeOf.bind	1,306,378 Ops/sec
.prototype.isPrototypeOf	910,448 Ops/sec
Object.prototype.toString.call	257,727 Ops/sec

Script Preparation code:

var isPro = o => o.prototype.isPrototypeOf.bind(o.prototype),
    isRx = isPro(RegExp),
    objType = o => Object.prototype.toString.call(o).slice(8, -1),
    oPTS = Object.prototype.toString,
    objType2 = o => oPTS.call(o).slice(8, -1),
    arr = [0, 1, 2, "", /a/],
    noShortHand = a =>
      typeof a === "string"               ? 1
      : RegExp.prototype.isPrototypeOf(a) ? 2
                                          : 3,
    shortHand = a =>
      typeof a === "string" ? 1
      : isRx(a)             ? 2
                            : 3,
    useObjType = a =>(
      t = objType(a),
      t === "String"   ? 1
      : t === "RegExp" ? 2
                       : 3
    ),
    useObjType2 = a =>(
      t = objType2(a),
      t === "String"   ? 1
      : t === "RegExp" ? 2
                       : 3
    );

Tests:

.prototype.isPrototypeOf
arr.forEach(e=>noShortHand(e));
.prototype.isPrototypeOf.bind
arr.forEach(e=>shortHand(e));
Object.prototype.toString.call
arr.forEach(e=>useObjType(e));
shorthand for Object.prototype.toString
arr.forEach(e=>useObjType2(e));