'advancedBy' API in Swift 2.0 [duplicate]

Question

'advance' API has been removed in Swift 2.0.

If we use 'advance' API in Swift 2.0, it is throwing error saying 'advance' is unavailable: call the '**advancedBy(n)**' method on the index.

How to get index using advancedBy API in Swift 2.0?

Below is my scenario:

let startIndex = advance(cardNumber.endIndex, -4) 
let lastFourDigitsOfPhoneNumber = phoneNumber.substringFromIndex(startIndex)

Answer 1

You need to call advancedBy on endIndex.

let startIndex = cardNumber.endIndex.advancedBy(-4)
let lastFourDigitsOfPhoneNumber = phoneNumber.substringFromIndex(startIndex)