Caching factory; usage syntax: cache = new CacheFactory(Math.random) cache(1)> 0.808444140246138; cache(2)> 0.9461546286474913; cache(1)> 0.808444140246138;

cache.js

CacheFactory = (function () {
    function compareThings() {
        var names = [
            arguments[0]["name"].toLowerCase(),
            arguments[1]["name"].toLowerCase()
        ];
        if (names[0] < names[1]) {
            return -1;
        }
        if (names[0] > names[1]) {
            return 1;
        }
        return 0;
    }

    return function (func) {
        var cache = {};
        return function (request) {
            var stringified_request;
            if (request) {
                switch (typeof request) {
                    case typeof []:
                        var sorted_request = request.sort(compareThings);
                        stringified_request = JSON.stringify(sorted_request);
                        break;
                    case typeof '':
                        stringified_request = request;
                        break;
                    case typeof 0:
                        stringified_request = request.toFixed(2);
                        break;
                    case typeof true:
                    case typeof function () {}:
                        stringified_request = request.toString();
                        break;
                }
            } else {
                switch (request) {
                    case 0 / 0:
                        stringified_request = 'NaN';
                        break;
                    case null:
                        stringified_request = 'null';
                        break;
                    case 1 / 0:
                        stringified_request = 'Infinity';
                        break;
                    case -1 / 0:
                        stringified_request = '-Infinity';
                        break;
                }
            }
            stringified_request = stringified_request || 'undefined';
            if (cache[stringified_request] === void 0) {
                cache[stringified_request] = func(request);
            }
            return cache[stringified_request]
        }
    }
})();