SOLVED: Day 4: Skipping items - test: Redefining let constant explanation – 100 Days of Swift

SOLVED: Day 4: Skipping items - test: Redefining let constant explanation

@pasimonek

Apr '21

Hi,

in "Skipping Items" test we have this code:

for i in 1...5 {
    if i == 5 {
        continue
    }
    let sum = i + i
    print("\(i) + \(i) is \(sum).")
}

, which is valid. I don't understand this part: "let sum = i + i", because I learned, that constant cannot be changed or defined again. Here we are definign constant with every round of loop and "sum" changing its value. So I'm confused, can you explain me please?

Thanks a lot.

@nemecek-filip

Apr '21

Hi, the thing here is "scope". The stuff inside for loop iteration is its own scope and goes away when the iteration ends. However inside the iteration scope you cannot redefine the constant.

This also means that sum is not available after the loop.

Sponsor Hacking with Swift and reach the world's largest Swift community!

Archived topic

This topic has been closed due to inactivity, so you can't reply. Please create a new topic if you need to.

All interactions here are governed by our code of conduct.