Exercise 2: Finding Why the Total Is 50 — Possible Solution
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TASK
Using a conditional breakpoint and the console commands, find why the total
is 50 and not 60.

STEPS
1. Put a breakpoint on the line  sum += scores[index].
2. Edit it to add a condition such as  index == scores.count - 1  so it stops
   only on the last iteration. (Chapter 4 notes the exact edit steps came from
   tutorials, so confirm them in your version.)
3. Run in the Simulator. When it pauses, run:
     p sum
     p index
     po scores
     bt

WHAT YOU SHOULD SEE
- index is 2, the last index.
- sum is 20 before the last addition of 30, so the loop has added only
  scores[1] and scores[2]; scores[0] was never used.
- The backtrace shows the call came from the view's body.

CAUSE AND FIX
The loop is 1..<scores.count, which starts at index 1. Loop from 0, for
example 0..<scores.count, or use scores.reduce(0, +).

CAUTION
These are the values the code implies; I did not see a debugger session.