Run results for: cache vs hard

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36

Browser: Chrome 64

Operating system: Windows

Device Platform: Other

Date tested: 2024 years ago

Test name	Executions per second
With cache	4787956.0 Ops/sec
without cache	526903.6 Ops/sec

Script Preparation code:

var Cache = /** @class */ (function () {
        function Cache() {
            this.internalCache = new Map();
        }
        Cache.prototype.get = function (key, cb) {
            if (this.internalCache.has(key)) {
                return this.internalCache.get(key);
            }
            var value = cb();
            this.internalCache.set(key, value);
            return value;
        };
        return Cache;
    }());

window.cacheInstance = new Cache();

Tests:

With cache
window.cacheInstance.get('isRootDomain', () => { const origin = window.location.origin // Lazy way to count number of "." characters const matches = origin.match(/\./g); return !!(matches && matches.length === 1); });
without cache
(function() { const origin = window.location.origin // Lazy way to count number of "." characters const matches = origin.match(/\./g); return !!(matches && matches.length === 1); })();

Run results for: cache vs hard

With cache

without cache