I have some question about the Code Challenge: Working With Operators: Part 2 Question 1.

Let's assume we're creating a silly game. In this game every time a user completes an objective (whatever it is) we increment their total score by 1 point.

In the editor below, initialScore is the players current score. Assuming they completed a single objective for this level, let's add 1 point to their score using the increment operator and assign the result to a constant named totalScore.

Remember that the position of the unary increment operator matters. For this task to pass, we want both totalScore and initialScore to have the same value after the increment operation.

So in the video about Unary Operators, we are working with variables because as people score points in a game, their score goes up. So it seems that the answer to the question would be:

var initialScore = 8

var totalScore = ++initialScore

However, in order to pass the challenge the Total Score has to be expressed in a constant:

var initialScore = 8

let totalScore = ++initialScore

Why is this? Wouldn't the Total Score be a variable if it's always changing?