Run results for: replaceAll vs regex replace vs split&join

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0

Browser: Firefox 139

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

split&join

11.6M/s

replace regex

11.5M/s

replace All

6.1M/s

View exact numbers

Test name	Executions per second
✓ split&join	11,566,712 Ops/sec
replace regex	11,481,043 Ops/sec
replace All	6,146,572 Ops/sec

Script Preparation code:

String.prototype.replaceAll = function(search, replacement) {
    var target = this;
    return target.replace(new RegExp(search, 'g'), replacement);
};

Tests:

replace regex
"this {a} is {a} it".replace(/\{a\}/g, "+");
replace All
"this {a} is {a} it".replaceAll("{a}", "+");
split&join
"this {a} is {a} it".split('{a}').join('+');