Run results for: Random hex string generation benchmark

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36

Browser: Chrome 113

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
genHexString1	503242.8 Ops/sec
genHexString2	354289.7 Ops/sec
genHexString3	458107.3 Ops/sec
genHexString4	290037.8 Ops/sec
genHexString5	460392.0 Ops/sec

Script Preparation code:

        function genHexString1(len) {
            return Array.from(crypto.getRandomValues(new Uint8Array(len / 2 ))).map(b => b.toString(16).padStart(2, '0')).join('');
        }

        function genHexString2(len) {
            const hex = '0123456789abcdef';
            let output = '';
            for (let i = 0; i < len; ++i) {
                output += hex.charAt(Math.floor(Math.random() * hex.length));
            }
            return output;
        }

        function genHexString3(len) {
            let arr = new Uint8Array((len / 2));
            window.crypto.getRandomValues(arr);
            return Array.from(arr, dec => ('0' + dec.toString(16)).substr(-2)).join('');
        }

        function genHexString4(len) {
            const hexChars = '0123456789abcdef';
            return [...Array(len)].map(() => hexChars[Math.floor(Math.random() * 16)]).join('');
        }

        function genHexString5(len) {
            let arr = new Uint8Array(len / 2);
            crypto.getRandomValues(arr);
            return btoa(String.fromCharCode.apply(null, arr)).replace(/[^a-f0-9]/g, '').substr(0, len);
        }

Tests:

genHexString1
const hex = genHexString1(20)
genHexString2
const hex = genHexString2(20)
genHexString3
const hex = genHexString3(20)
genHexString4
const hex = genHexString4(20)
genHexString5
const hex = genHexString5(20)