arrays_complex2.doggo

const reduce = fn(arr, initial, f) {
    const iter = fn(arr, result) {
        if (length(arr) == 0) {
          return result;
        }

        return iter(tail(arr), f(result, arr[0]));
    };

    return iter(arr, initial);
};

const sum = fn(arr) {
    reduce(arr, 0, fn(initial, curr) { return initial + curr; });
};

const array = [1, 3, 5, 91, 23];
print(sum(array));