add post about Optional.or(_:)

public/_data.json

@@ -19,6 +19,17 @@
     "title": "Curriculum vitae"
   },
   "posts": [
+    {
+      "title": "A nil-coalescing alternative for Swift",
+      "date": "6th October, 2017",
+      "timestamp": 1507324813,
+      "tags": [
+        "ios",
+        "swift"
+      ],
+      "author": "Sami J. Samhuri",
+      "url": "/posts/2017/10/swift-optional-or"
+    },
     {
       "title": "Easy Optimization Wins",
       "date": "10th August, 2016",
@@ -116,17 +127,6 @@
       "author": "Sami J. Samhuri",
       "url": "/posts/2015/07/scripts-to-rule-them-all",
       "link": "http://githubengineering.com/scripts-to-rule-them-all/"
-    },
-    {
-      "title": "→ Debugging Layouts with Recursive View Descriptions in Xcode",
-      "date": "2nd June, 2015",
-      "timestamp": 1433288135,
-      "tags": [
-
-      ],
-      "author": "Sami J. Samhuri",
-      "url": "/posts/2015/06/debugging-layouts-with-recursive-view-descriptions-in-xcode",
-      "link": "http://jeffreysambells.com/2013/01/24/debugging-layouts-with-recursive-view-descriptions-in-xcode"
     }
   ]
 }

public/posts/2017/10/_data.json

@@ -0,0 +1,15 @@
+{
+  "swift-optional-or": {
+    "id": "swift-optional-or",
+    "author": "Sami J. Samhuri",
+    "title": "A nil-coalescing alternative for Swift",
+    "date": "6th October, 2017",
+    "timestamp": 1507324813,
+    "link": null,
+    "url": "/posts/2017/10/swift-optional-or",
+    "tags": [
+      "ios",
+      "swift"
+    ]
+  }
+}

public/posts/2017/10/index.ejs

@@ -0,0 +1 @@
+<%- partial('../../_month') %>

public/posts/2017/10/swift-optional-or.md

@@ -0,0 +1,28 @@
+Swift compile times leave something to be desired and a common culprit is the affectionately-named [nil-coalescing operator][nilop]. A small extension to `Optional` can improve this without sacrificing a lot of readability.
+
+```Swift
+extension Optional {
+    func or(_ defaultValue: Wrapped) -> Wrapped {
+        switch self {
+        case .none: return defaultValue
+        case let .some(value): return value
+        }
+    }
+}
+```
+
+And you use it like so:
+
+```Swift
+let dict: [String : String] = [:]
+let maybeString = dict["not here"]
+print("the string is: \(maybeString.or("default"))")
+let otherString = dict["not here"].or("something else")
+```
+
+I'm sure someone else has come up with this already but I haven't seen it yet.
+
+_([gist available here][gist])_
+
+[nilop]: https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/BasicOperators.html#//apple_ref/doc/uid/TP40014097-CH6-ID72
+[gist]: https://gist.github.com/samsonjs/c8933c07ad985b74aba994f2fdab8b47

public/posts/2017/index.ejs

@@ -0,0 +1 @@
+<%- partial('../_year') %>