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

Swift 4

var str = "abcdefg"
let index = str.index(of: "c")?.encodedOffset // Result: 2

Note: If String contains same multiple characters, it will just get the nearest one from left

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