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| author | Adam Bard <github@adambard.com> | 2015-01-20 22:57:49 +0000 |
|---|---|---|
| committer | Adam Bard <github@adambard.com> | 2015-01-20 22:57:49 +0000 |
| commit | e6930e4b67cc0c979e898370c15dea521f30de58 (patch) | |
| tree | 77ecae1c1f7a9f334faa4ecf18fc1b67d0cb442a /swift.html.markdown | |
| parent | 6915f5bfd065434a24e52bf6b9fe2007b011e6cd (diff) | |
| parent | 7a55b4a9b1badebd4b9342304c902fde049dd172 (diff) | |
Merge pull request #935 from keito/master
Explain Optional Chaining
Diffstat (limited to 'swift.html.markdown')
| -rw-r--r-- | swift.html.markdown | 5 |
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?() |