Why is it best practice to use not operator in this case? Why can't we just write: let isWinner = (!10)
Thanks

Question

Is it because we need to establish that it can be any number < or > 10?
```operators.swift
// Enter your code below
var initialScore = 8
initialScore += 1
let isWinner = (!10)
```

Brandon Mahoney · Answer

You still have to compare initialScore to 10 not just assign the value of false to isWinner. Remember the goal is to check if initialScore is 10 or not.
Swift
var initialScore = 8
initialScore += 1
let isWinner = initialScore != 10

Also when you place ! in front of a object you are saying it is the opposite of it, not comparing. This is something used on type bool. You are attempting to use it here on type Int. Paste code below into a playground for a better understanding.
```Swift
var isUserLoggedIn = true
print(isUserLoggedIn)     //equals true
isUserLoggedIn = !isUserLoggedIn
print(isUserLoggedIn)     //equals false
isUserLoggedIn = !isUserLoggedIn
print(isUserLoggedIn)     //equals true again
```

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Simone Renaud

Simone Renaud

Why is it best practice to use not operator in this case? Why can't we just write: let isWinner = (!10) Thanks

1 Answer

Brandon Mahoney

Brandon Mahoney