From 7a55b4a9b1badebd4b9342304c902fde049dd172 Mon Sep 17 00:00:00 2001
From: Keito Uchiyama <projects@keito.me>
Date: Tue, 20 Jan 2015 14:52:31 -0800
Subject: Explain Optional Chaining

Without going into too much detail, mention optional chaining so it's
not confusing that there is a question mark suffix (it's not currently
mentioned anywhere on the page).
---
 swift.html.markdown | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'swift.html.markdown')

diff --git a/swift.html.markdown b/swift.html.markdown
index 2fbbe544..c6d2a8af 100644
--- a/swift.html.markdown
+++ b/swift.html.markdown
@@ -445,7 +445,10 @@ class MyShape: Rect {
     
     func grow() {
         sideLength += 2
-        
+
+        // Place a question mark after an optional property, method, or
+        // subscript to gracefully ignore a nil value and return nil
+        // instead of throwing a runtime error ("optional chaining").
         if let allow = self.delegate?.canReshape?() {
             // test for delegate then for method
             self.delegate?.reshaped?()
-- 
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