Added ArgumentParser to main project

- At Swift book's Functions and Closure section in Playgrounds (next up Objects and Classes)

Package.resolved

@@ -0,0 +1,15 @@
+{
+  "originHash" : "f3097f72511ac559eeb33298fe5d1aac2e73e26e2133181df5c213b8394d0ab0",
+  "pins" : [
+    {
+      "identity" : "swift-argument-parser",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-argument-parser",
+      "state" : {
+        "revision" : "cdd0ef3755280949551dc26dee5de9ddeda89f54",
+        "version" : "1.6.2"
+      }
+    }
+  ],
+  "version" : 3
+}

Package.swift

@@ -5,11 +5,19 @@ import PackageDescription
 
 let package = Package(
     name: "swiftyfox",
+    dependencies: [
+            // other dependencies
+            .package(url: "https://github.com/apple/swift-argument-parser", from: "1.3.0"),
+        ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
         // Targets can depend on other targets in this package and products from dependencies.
         .executableTarget(
-            name: "swiftyfox"
-        ),
+            name: "swiftyfox",
+            dependencies: [
+                // other dependencies
+                .product(name: "ArgumentParser", package: "swift-argument-parser"),
+            ]),
+        
     ]
 )

Sources/swiftyfox/swiftyfox.swift

@@ -1,11 +1,10 @@
-// The Swift Programming Language
-// https://docs.swift.org/swift-book
+import ArgumentParser
 
 @main
-struct swiftyfox {
+struct swiftyfox: ParsableCommand {
+    @Flag var verbose = false
+    
     static func main() {
         print("Hello, world!")
     }
 }
-
-

SwiftyFox.playground/Contents.swift

@@ -1,22 +1,28 @@
 import Cocoa
 
-let interestingNumbers = [
-    "Prime": [2, 3, 5, 7, 11, 13],
-    "Fibonacci": [1, 1, 2, 3, 5, 8],
-    "Square": [1, 4, 9, 16, 25],
-];
-
-var largest = 0
-
-for (_, numbers) in interestingNumbers {
-    for number in numbers {
-        if number > largest {
-            largest = number // 25
-        }
-    }
+func greet(_ person: String, on day: String) -> String {
+    return "Hello \(person), today is \(day)."
 }
 
-var total = 0
-for i in 0..<4 {
-    total += i // 6
+// "Hello Tony Bark, today is Tuesday."
+greet("Tony Bark", on: "Tuesday")
+
+func calcStats(scores: [Int]) -> (min: Int, max: Int, sum: Int) {
+    var min = scores[0]
+    var max = scores[0]
+    var sum = 0
+    
+    for score in scores {
+        if score > max {
+            max = score
+        } else if score < min {
+            min = score
         }
+        sum += score
+    }
+    
+    return (min, max, sum)
+}
+
+let stats = calcStats(scores: [5, 3, 100, 3, 9])
+let sum = stats.sum // 120