Run results for: Object.prototype.toString.call vs typeof

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

typeof -> object

877K/s

typeof -> boolean

857K/s

typeof -> function

752K/s

typeof -> string

705K/s

Object.prototype.toString.call -> function

360K/s

Object.prototype.toString.call -> boolean

344K/s

Object.prototype.toString.call -> string

312K/s

Object.prototype.toString.call -> object

262K/s

View exact numbers

Test name	Executions per second
✓ typeof -> object	877,469 Ops/sec
typeof -> boolean	856,719 Ops/sec
typeof -> function	751,850 Ops/sec
typeof -> string	705,186 Ops/sec
Object.prototype.toString.call -> function	360,288 Ops/sec
Object.prototype.toString.call -> boolean	343,713 Ops/sec
Object.prototype.toString.call -> string	312,344 Ops/sec
Object.prototype.toString.call -> object	261,716 Ops/sec

Script Preparation code:

var types = {
    array: [1, 2, 3],
    number: 123,
    string: '123',
    map: new Map([
        [1, 1],
        [2, 2],
        [3, 3]
    ]),
    set: new Set([1, 2, 3]),
    buffer: new ArrayBuffer([1, 2, 3]),
    boolean: true,
    arrow: () => {},
    function: function() {},
    object: {}
}

var keys = Object.keys(types)

Tests:

typeof -> string
keys.map(key => typeof types[key] === "string")
Object.prototype.toString.call -> string
keys.map(key => Object.prototype.toString.call(types[key]) === '[object String]')
typeof -> boolean
keys.map(key => typeof types[key] === "boolean")
Object.prototype.toString.call -> boolean
keys.map(key => Object.prototype.toString.call(types[key]) === '[object Boolean]')
typeof -> object
keys.map(key => typeof types[key] === "object")
Object.prototype.toString.call -> object
keys.map(key => Object.prototype.toString.call(types[key]) === '[object Object]')
typeof -> function
keys.map(key => typeof types[key] === "function")
Object.prototype.toString.call -> function
keys.map(key => Object.prototype.toString.call(types[key]) === '[object Function]')