Get string operations working on 3ds

day01/source/day01.swift

@@ -37,10 +37,10 @@ struct Day01 {
     }
 
     static func parseInput(_ input: String) -> [(Direction, Int)] {
-        input.utf8.split(separator: "\n".utf8.first!).map({ line in
+        input.split(separator: "\n").map({ line in
             return (
                 Direction(line.first!),
-                atoi(line.dropFirst())
+                Int(line.dropFirst())!
             )
         })
     }
@@ -87,20 +87,6 @@ struct Day01 {
         }
         print("Part 2: \(count)")
     }
-
-    static func atoi(_ str: Substring.UTF8View) -> Int {
-        var result = 0
-
-        for char in str {
-            if char >= 0x30 && char <= 0x39 {
-                result = result * 10 + (Int(char) - 0x30)
-            } else {
-                break
-            }
-        }
-
-        return result
-    }
 }
 
 
@@ -108,10 +94,10 @@ enum Direction {
     case Left
     case Right
 
-    init(_ char: UInt8) {
+    init(_ char: Character) {
         self = switch char {
-            case "L".utf8.first: Direction.Left
-            case "R".utf8.first: Direction.Right
+            case "L": Direction.Left
+            case "R": Direction.Right
             default: fatalError()
         }
     }