Run results for: typeof function vs call in function

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.1.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
typeof function	9300926.0 Ops/sec
call in function	6173735.5 Ops/sec
!!fn?.call	6911329.0 Ops/sec
fn?.call != null	9090097.0 Ops/sec
fn?.call != void 0	8914031.0 Ops/sec
isFuncTrue = fn?.call != undefined;	2929500.0 Ops/sec

Script Preparation code:

var fn = function(){};
var obj = {};
var objNull = null;
var unknown; // undefined

Tests:

typeof function
var isFuncTrue = typeof fn === 'function'; var isFuncFalse = typeof obj === 'function'; var isFuncFalse2 = typeof objNull === 'function'; var isFuncFalse3 = typeof unknown === 'function';
call in function
var isFuncTrue = fn && 'call' in fn; var isFuncFalse = obj && 'call' in obj; var isFuncFalse2 = objNull && 'call' in objNull; var isFuncFalse3 = unknown && 'call' in unknown;
!!fn?.call
var isFuncTrue = !!fn?.call; var isFuncFalse = !!obj?.call; var isFuncFalse2 = !!objNull?.call; var isFuncFalse3 = !!unknown?.call;
fn?.call != null
var isFuncTrue = fn?.call != null; var isFuncFalse = obj?.call != null; var isFuncFalse2 = objNull?.call != null; var isFuncFalse3 = unknown?.call != null;
fn?.call != void 0
var isFuncTrue = fn?.call != void 0; var isFuncFalse = obj?.call != void 0; var isFuncFalse2 = objNull?.call != void 0; var isFuncFalse3 = unknown?.call != void 0;
isFuncTrue = fn?.call != undefined;
var isFuncTrue = fn?.call != undefined; var isFuncFalse = obj?.call != undefined; var isFuncFalse2 = objNull?.call != undefined; var isFuncFalse3 = unknown?.call != undefined;

Run results for: typeof function vs call in function

typeof function

call in function

!!fn?.call

fn?.call != null

fn?.call != void 0

isFuncTrue = fn?.call != undefined;