Run results for: Exact string matching: RegExp vs Set

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.96 YaBrowser/20.4.0.3443 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 20

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
RegExp	9.7 Ops/sec
Set	12.0 Ops/sec

Script Preparation code:

var count = 100000;
var isoCodes = [
  'AUD',
  'CAD',
  'USD',
  'GBP',
  'EUR',
  'SGD'
];
var isoCodesPattern = new RegExp('^\\b(' + isoCodes.join('|') + ')\\b$');
var isoCodeSet = new Set(isoCodes);
var isoCodesToTest = isoCodes.concat(
  'JPY',
  'HKD',
  'NZD'
).sort();

Tests:

RegExp
for (let i = 0; i < count; i++) { for (const isoCode of isoCodesToTest) { isoCodesPattern.test(isoCode); } }
Set
for (let i = 0; i < count; i++) { for (const isoCode of isoCodesToTest) { isoCodeSet.has(isoCode); } }