Run results for: Normalize path: JS Regex vs .endsWith vs .indexOf vs .slice

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.101 Safari/537.36

Browser: Chrome 91

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
regex replace normalize	160.7 Ops/sec
endsWith slice normalize	431.9 Ops/sec
slice slice normalize	461.1 Ops/sec
lastIndexOf slice normalize	194.8 Ops/sec

HTML Preparation code:

<div></div>

Script Preparation code:

var data = window.data = [];
const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.";
var TOTAL_STRINGS = window.TOTAL_STRINGS = 100000;

function getRandomInt(max) {
    return Math.floor(Math.random() * max);
}

function makeRandomString(len) {
    var text = "";
    for (var i = 0; i < len; i++) {
        text += possible.charAt(getRandomInt(possible.length));
    }
    return text;
}

function makeRandomUrl(len) {
    var url = "file:///";
    for (var i = 0; i < len; i++) {
        url += makeRandomString(5 + getRandomInt(10));
        if (getRandomInt(2)) {
            url += "/";
        }
    }
    return url;
}

while (data.length < TOTAL_STRINGS) {
    data.push(makeRandomUrl(getRandomInt(10)));
}

Tests:

regex replace normalize
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; while (x < TOTAL_STRINGS) { const str = data[x]; const url = str.replace(/\/?$/, ''); x += 1; }
endsWith slice normalize
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; while (x < TOTAL_STRINGS) { const str = data[x]; const url = str.endsWith("/") ? str.slice(0, -1) : str; x += 1; }
slice slice normalize
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; while (x < TOTAL_STRINGS) { const str = data[x]; const url = str.slice(-1) === "/" ? str.slice(0, -1) : str; x += 1; }
lastIndexOf slice normalize
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; while (x < TOTAL_STRINGS) { const str = data[x]; const url = str.lastIndexOf("/") === str.length - 1 ? str.slice(0, -1) : str; x += 1; }

Run results for: Normalize path: JS Regex vs .endsWith vs .indexOf vs .slice

regex replace normalize

endsWith slice normalize

slice slice normalize

lastIndexOf slice normalize