Mutability warnings
About 1 min
Mutability warnings 관련
HACKING WITH SWIFT
What's new in Swift?
Mutability warnings | Changes in Swift 2.0
Mutability warnings
Available from Swift 2.0
This is a simple change that is going to go a long way to help code readability. As you know, Swift developers prefer declaring things as constants (using let) rather than variables (using var). But what if you made something a variable by accident? Or if you thought you might need to change it, then never do?
As of Xcode 7 and Swift 2, you'll get warnings in your code whenever you declare variables that never change – Xcode literally examines the way you use the variable and knows if you never change it.
Other changes in Swift 2.0…
Throwing errors | Changes in Swift 2.0
Throwing errors
Use the guard keyword for early returns | Changes in Swift 2.0
Use the guard keyword for early returns
Measure strings using their character count | Changes in Swift 2.0
Measure strings using their character count
Use the defer keyword to delay work until your scope exits | Changes in Swift 2.0
Use the defer keyword to delay work until your scope exits
Checking API availability | Changes in Swift 2.0
Checking API availability