javascriptNull / UndefinedMedium

Score calculation breaks on bad data

Time: 0:00

What it should do

sumScores(players) should add up every player's score, treating a player with no score as 0.

What goes wrong

As soon as one player is missing a score, the total becomes NaN instead of a number.

Hints

This is a null and undefined errors bug

Cannot read properties of undefined, NoneType has no attribute, NaN appearing from nowhere.