Swift - last index of string

Question

I am trying to get the last charcter from a given string. I know there is at least 1 character in the string. But when I write the code I get an error.

Here is my code:

func lastCharacter (of string: String) -> Character {
    guard string != "" else { 
        return errorCharacter 
    }

    return string[string.endIndex]
}

Here is the error:

error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0).

I think you might be overthinking this. What's wrong with just `str.charactes.last`? — Alexander, Apr 25 '18 at 18:03

score 4 · Answer 1 · answered Apr 25 '18 at 17:32

4

The endIndex of a thing is not a valid subscript of that thing. It is one beyond the last valid index.

The easiest way to get the last character of a string is to get the suffix(1) of the string or the last of the string.

answered Apr 25 '18 at 17:32

matt

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score 1 · Answer 2 · edited Apr 25 '18 at 18:03

1

Try

return string.last!

Hope that helps you!

edited Apr 25 '18 at 18:03

Alexander

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answered Apr 25 '18 at 17:40

Nick Perkins

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Swift - last index of string

2 Answers2