Error with String endIndex in Swift

Question

I have the following code:

let hello = "Hola"
let indexI = hello.startIndex
let indexF = hello.endIndex
hello[indexI] // "H"
hello[hello.startIndex] // H
hello[hello.index(after: indexI)] // o

hello[indexF] // Fatal error: Can't form a Character from an empty String

But I have an error in hello[indexF]Why?

In Xcode, if you option-click on endindex it says A string’s “past the end” position—that is, the position one greater than the last valid subscript argument. — vacawama
– vacawama, Commented Nov 12, 2017 at 19:59

Mo Abdul-Hameed · Accepted Answer · 2017-11-12 20:00:07Z

7

If you want to access the last element you need to replace:

let indexF = hello.endIndex

With:

let indexF = hello.index(before: hello.endIndex)

The documentation of endIndex says:

A string’s “past the end” position—that is, the position one greater than the last valid subscript argument.

answered Nov 12, 2017 at 20:00

Mo Abdul-Hameed

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