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-rw-r--r--swift.html.markdown5
1 files changed, 4 insertions, 1 deletions
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?()