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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

typeof -> string

2.7M/s

typeof -> boolean

2.7M/s

typeof -> function

2.4M/s

typeof -> object

2.4M/s

Object.prototype.toString.call -> boolean

980K/s

Object.prototype.toString.call -> string

972K/s

Object.prototype.toString.call -> object

963K/s

Object.prototype.toString.call -> function

933K/s

View exact numbers

Test name	Executions per second
✓ typeof -> string	2,681,463 Ops/sec
typeof -> boolean	2,651,485 Ops/sec
typeof -> function	2,427,701 Ops/sec
typeof -> object	2,423,794 Ops/sec
Object.prototype.toString.call -> boolean	979,865 Ops/sec
Object.prototype.toString.call -> string	971,714 Ops/sec
Object.prototype.toString.call -> object	962,970 Ops/sec
Object.prototype.toString.call -> function	932,573 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]')