type “string” doesn't conform to protocol “sequence”

Question

Why does it come to this when I try to print every char in string a?

import Foundation


let a = "what is this"
for b in a {
    print(b)
}

Answer 1

A String is not a sequence, you need to call the characters property to get a sequence .

let a = "what is this"
for b in a.characters {
  print(b, terminator: "")
}

// "what is this"

Answer 2

You have to use the characters member variable of String if you want to enumerate all the characters.

let a = "what is this"
for b in a.characters 
{
   print(b)
}