Run results for: double equals null vs boolean

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

Browser: Chrome 83

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
== null	1565329.0 Ops/sec
implicit boolean conversion	1541255.0 Ops/sec
explicit boolean conversion	1559756.0 Ops/sec
typeof + triple equals null	1560619.0 Ops/sec

Script Preparation code:

var values = [(function*() {})(), undefined, null, {}];

Tests:

== null
let isIterable; for (const value of values) { isIterable = value != null && typeof value[Symbol.iterator] === "function"; }
implicit boolean conversion
let isIterable; for (const value of values) { isIterable = value && typeof value[Symbol.iterator] === "function"; }
explicit boolean conversion
let isIterable; for (const value of values) { isIterable = !!value && typeof value[Symbol.iterator] === "function"; }
typeof + triple equals null
let isIterable; for (const value of values) { isIterable = typeof value !== "undefined" && value !== null && typeof value[Symbol.iterator] === "function"; }