Why i received error when trying to print var(Short code)

Question

CANT PRINT VARIABLE IN LAST LINE

import Foundation
func string_a(_ input: String) -> String {
var chars = input
let index_start = chars.index(after: chars.startIndex)
let index_end = chars.index(before: chars.endIndex)
let middleRange = index_start ..< index_end

var sub_string = chars [middleRange]
var newString = String (sub_string) //IT WONT PRINT THIS

while sub_string.contains("a") {
sub_string.remove(at: sub_string.firstIndex(of: "a")!)
}

chars.replaceSubrange(middleRange, with: sub_string)

return String(chars)
}

print(string_a("abcaad"))
print(string_a("abcada"))
print(newString) //Errmsg: Cannot find newString in scope

Answer 1

newString only exists withing the scope of the function string_a(). It cannot be accessed outside of the function.

Answer 2

You can print it from inside the function. Put the print statement under the line where newString is defined.