Run results for: reduce vs map & join

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.106 Safari/537.36

Browser: Chrome 91

Operating system: Windows 7

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var strings = [],
    prefix = "abc";
for (var i = 0; i < 1000; i++) {
    strings.push("" + i + i);
}

Tests:

for-i
let result = ""; const len = strings.length; for (let i = 0; i < len; i++) { result += prefix + strings[i]; }
reduce
const result = strings.reduce((accum, el) => accum + prefix + el, "");
map & join
const result = strings.map(el => prefix + el).join("");
for-of
let result = ""; for (const el of strings) { result += prefix + el; }