Wordle comparison: Difference between revisions

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@@ Line 909: / Line 909: @@
 BBAABBB vs BBBBBAA      green green yellow yellow green yellow yellow
 BBAABBB vs AABBBAA      yellow yellow yellow yellow green grey grey
+</pre>
+=={{header|Swift}}==
+<lang swift>enum Colour : CustomStringConvertible {
+  case grey
+  case yellow
+  case green
+  var description : String {
+    switch self {
+    case .grey: return "grey"
+    case .yellow: return "yellow"
+    case .green: return "green"
+    }
+  }
+}
+func wordle(answer: String, guess: String) -> [Colour]? {
+    guard answer.count == guess.count else {
+        return nil
+    }
+    var a = Array(answer)
+    let g = Array(guess)
+    let n = a.count
+    var result = Array(repeating: Colour.grey, count: n)
+    for i in 0..<n {
+        if g[i] == a[i] {
+            a[i] = "\0"
+            result[i] = Colour.green
+        }
+    }
+    for i in 0..<n {
+        if let j = a.firstIndex(of: g[i]) {
+            a[j] = "\0"
+            result[i] = Colour.yellow
+        }
+    }
+    return result
+}
+let pairs = [("ALLOW", "LOLLY"), ("BULLY", "LOLLY"),
+              ("ROBIN", "ALERT"), ("ROBIN", "SONIC"),
+              ("ROBIN", "ROBIN")]
+for pair in pairs {
+    if let result = wordle(answer: pair.0, guess: pair.1) {
+        print("\(pair.0) v \(pair.1) => \(result)")
+    }
+}</lang>
+{{out}}
+<pre>
+ALLOW v LOLLY => [yellow, yellow, green, grey, grey]
+BULLY v LOLLY => [grey, grey, green, green, green]
+ROBIN v ALERT => [grey, grey, grey, yellow, grey]
+ROBIN v SONIC => [grey, green, yellow, green, grey]
+ROBIN v ROBIN => [green, green, green, green, green]
 </pre>