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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
replace regex	10722521.0 Ops/sec
replace All	5482689.0 Ops/sec
split&join	12339397.0 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('+');

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

replace regex

replace All

split&join