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/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

typeof -> boolean

16.6M/s

typeof -> function

16.6M/s

typeof -> string

16.3M/s

typeof -> object

16.3M/s

Object.prototype.toString.call -> function

6.5M/s

Object.prototype.toString.call -> string

6.5M/s

Object.prototype.toString.call -> boolean

6.5M/s

Object.prototype.toString.call -> object

6.4M/s

View exact numbers

Test name	Executions per second
✓ typeof -> boolean	16,611,017 Ops/sec
typeof -> function	16,607,866 Ops/sec
typeof -> string	16,324,903 Ops/sec
typeof -> object	16,252,367 Ops/sec
Object.prototype.toString.call -> function	6,519,179 Ops/sec
Object.prototype.toString.call -> string	6,476,530 Ops/sec
Object.prototype.toString.call -> boolean	6,472,016 Ops/sec
Object.prototype.toString.call -> object	6,446,493 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]')