Benchmark: typeof val === "undefined" vs !val vs val === undefined

Script Preparation code:

const undef = undefined
function checkType(val) {
  return typeof val === 'undefined'
}
function negate(val) {
  return !val
}
function equality(val) {
  return val === undefined;
}

Tests:

typeof
const undef = undefined checkType(undef)
negate
const undef = undefined negate(undef)
equality
const undef = undefined equality(undef)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
typeof
negate
equality

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser/OS: Chrome 112 on Windows

View result in a separate tab

Test name	Executions per second
typeof	1129645.0 Ops/sec
negate	1189622.0 Ops/sec
equality	708106.0 Ops/sec

typeof val === "undefined" vs !val vs val === undefined (version: 0)

Comparing performance of: typeof vs negate vs equality

Created: one year ago by: Guest

Jump to the latest result

typeof

negate

equality

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A