diff options
| author | Keito Uchiyama <projects@keito.me> | 2015-01-20 14:52:31 -0800 |
|---|---|---|
| committer | Keito Uchiyama <projects@keito.me> | 2015-01-20 14:55:07 -0800 |
| commit | 7a55b4a9b1badebd4b9342304c902fde049dd172 (patch) | |
| tree | 77ecae1c1f7a9f334faa4ecf18fc1b67d0cb442a /swift.html.markdown | |
| parent | 6915f5bfd065434a24e52bf6b9fe2007b011e6cd (diff) | |
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).
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?() |