TJRoger · July 4, 2020 09:30 · Jan 29, 2020
diff --git a/TupleToArray.swift b/TupleToArray.swift
@@ -0,0 +1,47 @@
+/**
+ # Tuple-to-array for Swift
+
+ By Ethan McTague - January 28, 2020
+ This source code is in the public domain.
+
+ ## Example
+
+ To convert a tuple of Ints into an array of ints:
+
+ ```
+ let ints = (10, 20, 30)
+ let result = [Int].fromTuple(ints)
+ print(result!) // prints Optional([10, 20, 30])
+ ```
+
+ */
+
+import Cocoa
+
+extension Array {
+
+    /**
+     Attempt to convert a tuple into an Array.
+
+     - Parameter tuple: The tuple to try and convert. All members must be of the same type.
+     - Returns: An array of the tuple's values, or `nil` if any tuple members do not match the `Element` type of this array.
+     */
+    static func fromTuple<Tuple> (_ tuple: Tuple) -> [Element]? {
+        let val = Array<Element>.fromTupleOptional(tuple)
+        return val.allSatisfy({ $0 != nil }) ? val.map { $0! } : nil
+    }
+
+    /**
+     Convert a tuple into an array.
+
+     - Parameter tuple: The tuple to try and convert.
+     - Returns: An array of the tuple's values, with `nil` for any values that could not be cast to the `Element` type of this array.
+     */
+    static func fromTupleOptional<Tuple> (_ tuple: Tuple) -> [Element?] {
+        return Mirror(reflecting: tuple)
+            .children
+            .filter { child in
+                (child.label ?? "x").allSatisfy { char in ".1234567890".contains(char) }
+            }.map { $0.value as? Element }
+    }
+}