I'm just confused why we use a constant in For In Loops? We are changing the output- isn't that a variable?

Each time you pass through the for-in loop, the looping constant (say, x in the loop for x in y) is created anew with the current value, rather than it being a variable whose value is updated.

It's not changing a variable, but repeating a set of instructions using a different constant value each time. Unless you introduce some other mutating variable into the loop, each trip through the loop doesn't really know anything about the previous trips.

Making the loop value constant removes some ambiguity of behavior, too. Imagine we're doing a loop through names, as in:

for n in names { ... }

What if we were to change a name while we were in that loop, like n = "Joshua"? Should that change then be reflected in the original array as well, or would n be entirely local to the loop? Most likely it would be the latter, but using a constant prevents the confusion entirely.

Thank you so much, Gentlemen. I am definitely stuck here. It's a new concept for me. I'm thinking having a better math-mind would help. Your answers are greatly appreciated.