Memoize in Javacript

memo.js

// for firefox31
const memoize = func =>
{
    let memo = {};
    return _ =>
    {
        if (!(arguments in memo))
        {
            memo[arguments] = func.apply(this, arguments);
        }
        return memo[arguments];
    };
};

const f = (x, y, z) => x <= y ? y : f(f(x-1, y, z), f(y-1, z, x), f(z-1, x, y));
const memf = memoize(f);

memf(14, 1, 0); // 3260 ms
memf(14, 1, 0); // 0.00849 ms