How to convert “Index” to type “Int” in Swift?

Question

I want to convert the index of a letter contained within a string to an integer value. Attempted to read the header files but I cannot find the type for Index,

Answer 1

encodedOffset has deprecated from Swift 4.2.

Deprecation message: encodedOffset has been deprecated as most common usage is incorrect. Use utf16Offset(in:) to achieve the same behavior.

So we can use utf16Offset(in:) like this:

var str = "abcdefgc"
let index = str.index(of: "c")?.utf16Offset(in: str) // Result: 2