Javascript function cache

function_cache.js

const memoize = (fn) => {
    let cache = {};
    return (...args) => {

        let n = fn(...args);

        if (n in cache) {
            console.log('Result from cache', cache[n]);
            return cache[n];
        }
        else {
            console.log('Result from execute', fn(...args));
            let result = fn(...args);
            cache[n] = result;
            return result;
        }
    }
}

// for testing..

const add = (a,b) => (a+b);
const mul = (a,b) => (a*b);

const memoizedAdd = memoize(add);
const memoizedMul = memoize(mul);

memoizedAdd(1,2);
memoizedAdd(1,2);

memoizedMul(3,5);
memoizedMul(3,5);