/**
 * @param {Function} fn
 * @return {Function}
 */
function memoize(fn) {
    let memo = {};
    return function (...args) {
        let argsjson = JSON.stringify(args);
        if (memo.hasOwnProperty(argsjson)) return memo[argsjson];
        return (memo[argsjson] = fn(...args));
    };
}

/**
 * let callCount = 0;
 * const memoizedFn = memoize(function (a, b) {
 *	 callCount += 1;
 *   return a + b;
 * })
 * memoizedFn(2, 3) // 5
 * memoizedFn(2, 3) // 5
 * console.log(callCount) // 1
 */