From 0e238166639d46c6353a3e6ee4ccc9aa68f40e34 Mon Sep 17 00:00:00 2001
From: Riley Pacella <rpacella@umich.edu>
Date: Sat, 25 Jun 2016 17:08:05 -0400
Subject: [PATCH 1/4] challenge 1

---
 challenge1.playground/Contents.swift          |  20 ++++++++++++++++++
 challenge1.playground/contents.xcplayground   |   4 ++++
 .../contents.xcworkspacedata                  |   7 ++++++
 .../UserInterfaceState.xcuserstate            | Bin 0 -> 10161 bytes
 4 files changed, 31 insertions(+)
 create mode 100644 challenge1.playground/Contents.swift
 create mode 100644 challenge1.playground/contents.xcplayground
 create mode 100644 challenge1.playground/playground.xcworkspace/contents.xcworkspacedata
 create mode 100644 challenge1.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate

diff --git a/challenge1.playground/Contents.swift b/challenge1.playground/Contents.swift
new file mode 100644
index 0000000..2ce687e
--- /dev/null
+++ b/challenge1.playground/Contents.swift
@@ -0,0 +1,20 @@
+//Challenge 1
+
+import UIKit
+
+func swap(inout var1: Any, inout with var2: Any) { (var1, var2) = (var2, var1) }
+
+var var1 = "hi", var2 = "bye"
+swap(&var1, &var2)
+
+[var1, var2]
+
+
+
+
+
+
+
+
+
+
diff --git a/challenge1.playground/contents.xcplayground b/challenge1.playground/contents.xcplayground
new file mode 100644
index 0000000..5da2641
--- /dev/null
+++ b/challenge1.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file
diff --git a/challenge1.playground/playground.xcworkspace/contents.xcworkspacedata b/challenge1.playground/playground.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/challenge1.playground/playground.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/challenge1.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate b/challenge1.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 0000000000000000000000000000000000000000..246ef85dc799aa68b4b876b01ddfdc50fa6cd2bc
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HcmV?d00001


From dfb6ce6e2f669788306ddcf0ba12b494366e9a30 Mon Sep 17 00:00:00 2001
From: Riley Pacella <rpacella@umich.edu>
Date: Sat, 25 Jun 2016 17:08:14 -0400
Subject: [PATCH 2/4] challenge 2

---
 challenge2.playground/Contents.swift          |  26 ++++++++++++++++++
 challenge2.playground/contents.xcplayground   |   4 +++
 .../contents.xcworkspacedata                  |   7 +++++
 .../UserInterfaceState.xcuserstate            | Bin 0 -> 7919 bytes
 4 files changed, 37 insertions(+)
 create mode 100644 challenge2.playground/Contents.swift
 create mode 100644 challenge2.playground/contents.xcplayground
 create mode 100644 challenge2.playground/playground.xcworkspace/contents.xcworkspacedata
 create mode 100644 challenge2.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate

diff --git a/challenge2.playground/Contents.swift b/challenge2.playground/Contents.swift
new file mode 100644
index 0000000..9b84bc5
--- /dev/null
+++ b/challenge2.playground/Contents.swift
@@ -0,0 +1,26 @@
+//: Playground - noun: a place where people can play
+
+
+func flexSrings(s1: String?, s2: String?) -> String
+{
+    if (s1==nil && s2==nil) {
+        return("none")
+    }
+    
+    if (s2==nil && s1 != nil) {
+        return(s1!)
+    }
+        
+    else {
+        return (s1!+s2!)
+    }
+
+}
+
+
+flexSrings(nil, s2: nil)
+
+
+
+
+
diff --git a/challenge2.playground/contents.xcplayground b/challenge2.playground/contents.xcplayground
new file mode 100644
index 0000000..5da2641
--- /dev/null
+++ b/challenge2.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file
diff --git a/challenge2.playground/playground.xcworkspace/contents.xcworkspacedata b/challenge2.playground/playground.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/challenge2.playground/playground.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/challenge2.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate b/challenge2.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate
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From 3688f8ed33ab404038630d2a605f0ea25ee708e6 Mon Sep 17 00:00:00 2001
From: Riley Pacella <rpacella@umich.edu>
Date: Sat, 25 Jun 2016 17:08:31 -0400
Subject: [PATCH 3/4] challenge 3

---
 challenge3.playground/Contents.swift          |  48 ++++++++++++++++++
 challenge3.playground/contents.xcplayground   |   4 ++
 .../contents.xcworkspacedata                  |   7 +++
 .../UserInterfaceState.xcuserstate            | Bin 0 -> 7923 bytes
 4 files changed, 59 insertions(+)
 create mode 100644 challenge3.playground/Contents.swift
 create mode 100644 challenge3.playground/contents.xcplayground
 create mode 100644 challenge3.playground/playground.xcworkspace/contents.xcworkspacedata
 create mode 100644 challenge3.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate

diff --git a/challenge3.playground/Contents.swift b/challenge3.playground/Contents.swift
new file mode 100644
index 0000000..aee32fe
--- /dev/null
+++ b/challenge3.playground/Contents.swift
@@ -0,0 +1,48 @@
+func sumAny(inputs: Any...) -> String {
+    
+    var total: Int = 0
+    
+    // add -10 if string is empty
+    if (inputs.isEmpty) {
+        total += -10
+    }
+    
+    var i = 0
+    
+    
+    // loop over all inputs
+    while (i<inputs.count) {
+        
+        // check if input type is an Int
+        if (inputs[i] is Int) {
+            let inputVar = inputs[i] as! Int // makes input an int iff it is an int
+            
+            // add -10 if input == 0
+            if (inputVar == 0) {
+            total += -10
+            }
+            
+            else {
+               total += inputVar
+            }
+        }
+        
+        // check if input type is a string
+        if ((inputs[i] is String)) {
+            let inputString = String(inputs[i]) // assigns a variable to input iff it is a string
+            
+            if let inputVar = Int(inputString) { // changes string to an Int iff it is an integer that was just passed as a string
+                
+                // add a string value iff it is positive number
+                if (inputVar >= 0) {
+                    total += inputVar
+                }
+            }
+        }
+        i += 1 // count to iterate over all inputs
+    }
+    
+    let totalString = String(total)
+    return totalString
+    }
+print(sumAny("Marin Rood", 2, 22, "10", 0, 33, -5))
diff --git a/challenge3.playground/contents.xcplayground b/challenge3.playground/contents.xcplayground
new file mode 100644
index 0000000..5da2641
--- /dev/null
+++ b/challenge3.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file
diff --git a/challenge3.playground/playground.xcworkspace/contents.xcworkspacedata b/challenge3.playground/playground.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/challenge3.playground/playground.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/challenge3.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate b/challenge3.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
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HcmV?d00001


From e815626592b8fba0cd124d8cceb7e9842355ea79 Mon Sep 17 00:00:00 2001
From: Riley Pacella <rpacella@umich.edu>
Date: Sat, 25 Jun 2016 17:08:42 -0400
Subject: [PATCH 4/4] challenge 4

---
 challenge4.playground/Contents.swift             |   9 +++++++++
 challenge4.playground/contents.xcplayground      |   4 ++++
 .../contents.xcworkspacedata                     |   7 +++++++
 .../UserInterfaceState.xcuserstate               | Bin 0 -> 7781 bytes
 4 files changed, 20 insertions(+)
 create mode 100644 challenge4.playground/Contents.swift
 create mode 100644 challenge4.playground/contents.xcplayground
 create mode 100644 challenge4.playground/playground.xcworkspace/contents.xcworkspacedata
 create mode 100644 challenge4.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate

diff --git a/challenge4.playground/Contents.swift b/challenge4.playground/Contents.swift
new file mode 100644
index 0000000..4eab3c3
--- /dev/null
+++ b/challenge4.playground/Contents.swift
@@ -0,0 +1,9 @@
+func countFrom(from: Int, to: Int) {
+    print(from)
+    
+    if (from < to) {
+        countFrom(from + 1, to: to)
+    }
+}
+
+countFrom(1, to: 5)
diff --git a/challenge4.playground/contents.xcplayground b/challenge4.playground/contents.xcplayground
new file mode 100644
index 0000000..5da2641
--- /dev/null
+++ b/challenge4.playground/contents.xcplayground
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file
diff --git a/challenge4.playground/playground.xcworkspace/contents.xcworkspacedata b/challenge4.playground/playground.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/challenge4.playground/playground.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/challenge4.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate b/challenge4.playground/playground.xcworkspace/xcuserdata/Riley.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
index 0000000000000000000000000000000000000000..c5731003877f8bee4db9ef505057b7ba2177198a
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