Memoize using a promise (angular $q)

memoize.js

/* 
 * 
 * Memoizes call to a service using a promise 
 * 
 */
function memoizeWithPromise(getFn) {
    let memoizedCalls = new Map();

    return function(...args) {
        let serializedArgs = JSON.stringify(args);
        if (memoizedCalls.has(serializedArgs)) {
            return memoizedCalls.get(serializedArgs);
        } else {
            let promise = getFn(...args);
            memoizedCalls.set(serializedArgs, promise);
            return promise;
            // also 
            // let promise = $q.when(getFn(...args));
            //  memoizedCalls.set(serializedArgs, promise);
            // return promise;
            // http://www.bennadel.com/blog/2735-q-when-is-the-missing-q-resolve-method-in-angularjs.htm
        }
    }
}

Got code review from the reddits! Yey! 👍 🙇 https://www.reddit.com/r/javascript/comments/425tv2/would_you_mind_codereviewing_this_memoize/