Return non-optional array up to the last int from integers()

common/Extensions.swift

@@ -6,10 +6,9 @@ extension Scanner {
         return scanString(string) != nil
     }
 
-    func integers() -> [Int]? {
+    func integers() -> [Int] {
         var numbers: [Int] = []
-        while !isAtEnd {
-            guard let num = scanInt() else { return nil }
+        while let num = scanInt() {
             numbers.append(num)
         }
         return numbers

day1/main.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-let input = Scanner(string: loadData(day: 1)).integers()!
+let input = Scanner(string: loadData(day: 1)).integers()
 
 for i in 0..<input.count {
     for j in i..<input.count   {

day10/main.swift

@@ -3,7 +3,7 @@ import Foundation
 let input = loadData(day: 10)
 let scanner = Scanner(string: input)
 
-var adapters = scanner.integers()!.sorted { $0 > $1 }
+var adapters = scanner.integers().sorted { $0 > $1 }
 adapters.append(0)
 
 

day9/main.swift

@@ -3,7 +3,7 @@ import Foundation
 let input = loadData(day: 9)
 let scanner = Scanner(string: input)
 
-let numbers = scanner.integers()!
+let numbers = scanner.integers()
 
 var weakness: Int? = nil
 outer: for i in 25..<numbers.count {