Run results for: declare test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
func1	33.3 Ops/sec
func2	65.9 Ops/sec

Script Preparation code:

var func1 = function(obj) {
	if (obj !== undefined) { return obj.x; }
}
var func2 = function(obj) {
	if (obj) { return obj.x; }
}

var ar1 = [];
var ar2 = [];

for (let i = 0; i < 1e5; i++) {
	ar1.push(Math.random() < 0.5 ? void 0 : {'x': Math.random()});
	ar2.push(Math.random() < 0.5 ? void 0 : {'x': Math.random()});
}

for (let i = 0; i < 1e3; ++i) {
	func1(Math.random() < 0.5 ? void 0 : {'x': Math.random()});
	func2(Math.random() < 0.5 ? void 0 : {'x': Math.random()});
}

Tests:

func2
for (let i = 0; i < 1e5; ++i) { func2(ar1[i]); }
func1
for (let i = 0; i < 1e5; ++i) { func1(ar1[i]); }