Real-life: reduce() a cart total

Sum up the cart items with reduce.

1. Solve the task in the editor — no long theory.
2. Run the check and compare your output with the expected result.
3. Stuck? Open the solution and carry the approach into your own code.

const { from, reduce } = Rx;

const prices = [10, 20, 30];

const result$ = from(prices).pipe(
  reduce((total, price) => total + price, 0)
);

result$.subscribe(value => console.log(value));