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iOS Closures in Swift 2 First Class Functions Higher Order Functions

Posted by Arsene Lavaux
Arsene Lavaux
4,342 Points

Extract first character of Swift String object instance using the characters property

How do you extract the fist character from a string instance in Swift?

See my code in attachment, probably don't have the right syntax to extract proper index...?

functions.swift 
extension String {
      func modify(fun: String -> String) -> String {
          return fun(self)
          }

      func firstLetter(str: String -> String) {
          return str.characters.startIndex
          }
      }

2 Answers

Arsene Lavaux
Arsene Lavaux
4,342 Points

I actually figured one solution out. Please feel free to share if you have something better.

Here is my code:

let str: String = "Hello"

str.characters.startIndex
str.characters[str.characters.startIndex]
Abhishek Salokhe
Abhishek Salokhe
10,612 Points
Abhishek Salokhe
Abhishek Salokhe
10,612 Points

Bit late, but you may use like below:

let message = "Hello World"
print(message.first)

Done. .first will return the first character of the string. Make sure you check on empty string/nil result.