diff --git a/Source/Constraint.swift b/Source/Constraint.swift
index b671494..124153f 100644
--- a/Source/Constraint.swift
+++ b/Source/Constraint.swift
@@ -313,7 +313,7 @@ public class Constraint {
                 NSException(name: "Cannot Install Constraint", reason: "Already installed on different view.", userInfo: nil).raise()
                 return []
             }
-            return (self.installedLayoutConstraints?.allObjects as? Array<LayoutConstraint>)!
+            return self.installedLayoutConstraints?.allObjects as! Array<LayoutConstraint>
         }
         
         var newLayoutConstraints = Array<LayoutConstraint>()
@@ -465,9 +465,9 @@ public class Constraint {
     
     private func constrainTo(other: ConstraintItem, relation: ConstraintRelation) -> Constraint {
         if other.attributes != ConstraintAttributes.None {
-            var toLayoutAttributes = other.attributes.layoutAttributes
+            let toLayoutAttributes = other.attributes.layoutAttributes
             if toLayoutAttributes.count > 1 {
-                var fromLayoutAttributes = self.fromItem.attributes.layoutAttributes
+                let fromLayoutAttributes = self.fromItem.attributes.layoutAttributes
                 if toLayoutAttributes != fromLayoutAttributes {
                     NSException(name: "Invalid Constraint", reason: "Cannot constrain to multiple non identical attributes", userInfo: nil).raise()
                     return self
@@ -509,22 +509,22 @@ public class Constraint {
     }
     
     private class func closestCommonSuperviewFromView(fromView: View?, toView: View?) -> View? {
-        var views = NSMutableSet()
+        var views = Set<View>()
         var fromView = fromView
         var toView = toView
         do {
             if let view = toView {
-                if views.containsObject(view) {
+                if views.contains(view) {
                     return view
                 }
-                views.addObject(view)
+                views.insert(view)
                 toView = view.superview
             }
             if let view = fromView {
-                if views.containsObject(view) {
+                if views.contains(view) {
                     return view
                 }
-                views.addObject(view)
+                views.insert(view)
                 fromView = view.superview
             }
         } while (fromView != nil || toView != nil)
diff --git a/Source/ConstraintItem.swift b/Source/ConstraintItem.swift
index 1c3c69d..135af1e 100644
--- a/Source/ConstraintItem.swift
+++ b/Source/ConstraintItem.swift
@@ -41,22 +41,12 @@ public class ConstraintItem {
     internal var attributes: ConstraintAttributes
     
     internal var view: View? {
-        get {
-            if let view = self.object as? View {
-                return view
-            }
-            return nil
-        }
+        return self.object as? View
     }
     
     #if os(iOS)
     internal var layoutSupport: UILayoutSupport? {
-        get {
-            if let layoutSupport = self.object as? UILayoutSupport {
-                return layoutSupport
-            }
-            return nil
-        }
+        return self.object as? UILayoutSupport
     }
     #endif
 }
diff --git a/Source/View+Snap.swift b/Source/View+Snap.swift
index 09d1bab..31039ef 100644
--- a/Source/View+Snap.swift
+++ b/Source/View+Snap.swift
@@ -95,7 +95,7 @@ public extension View {
             if let constraints = objc_getAssociatedObject(self, &installedLayoutConstraintsKey) as? Array<LayoutConstraint> {
                 return constraints
             }
-            return Array<LayoutConstraint>()
+            return []
         }
         set {
             objc_setAssociatedObject(self, &installedLayoutConstraintsKey, newValue, UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))