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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:131.0) Gecko/20100101 Firefox/131.0

Browser: Firefox 131

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

typeof -> string

15.8M/s

typeof -> function

14.0M/s

typeof -> boolean

11.2M/s

typeof -> object

10.3M/s

Object.prototype.toString.call -> function

3.2M/s

Object.prototype.toString.call -> string

2.9M/s

Object.prototype.toString.call -> boolean

2.9M/s

Object.prototype.toString.call -> object

2.9M/s

View exact numbers

Test name	Executions per second
✓ typeof -> string	15,782,823 Ops/sec
typeof -> function	13,957,343 Ops/sec
typeof -> boolean	11,151,455 Ops/sec
typeof -> object	10,339,821 Ops/sec
Object.prototype.toString.call -> function	3,182,986 Ops/sec
Object.prototype.toString.call -> string	2,924,286 Ops/sec
Object.prototype.toString.call -> boolean	2,923,550 Ops/sec
Object.prototype.toString.call -> object	2,891,378 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]')