Run results for: Native XHR vs XHR 2 (no ifs... just switches)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Native XHR (via switch instead of if)	10383.0 Ops/sec
Native XHR (enhanced)	9719.3 Ops/sec
Native XHR 2	6714.5 Ops/sec
Fetch	6862.0 Ops/sec

Script Preparation code:

function showResult(data) {
    //console.log(data);
}
var newUrl = "https://www.googleapis.com/discovery/v1/apis";

Tests:

Native XHR (via switch instead of if)
var xhr = new XMLHttpRequest(); xhr.open("GET", newUrl, true); xhr.onreadystatechange = function() { switch(xhr.readyState){ case 4: showResult(xhr); break; } } xhr.send();
Native XHR (enhanced)
var xhr = new XMLHttpRequest(); xhr.open("GET", newUrl, true); xhr.onreadystatechange = function() { if (xhr.readyState === 4) { showResult(xhr); } } xhr.send();
Native XHR 2
var xhr = new XMLHttpRequest(); xhr.onload = showResult; xhr.open("GET", newUrl, true); xhr.send();
Fetch
var request = fetch(newUrl).then(showResult);