diff options
| -rw-r--r-- | swift.html.markdown | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/swift.html.markdown b/swift.html.markdown index 46768375..e921e7ea 100644 --- a/swift.html.markdown +++ b/swift.html.markdown @@ -94,6 +94,8 @@ var unwrappedString: String! = "Value is expected." // same as above, but ! is a postfix operator (more syntax candy) var unwrappedString2: ImplicitlyUnwrappedOptional<String> = "Value is expected." +// If let structure - +// If let is a special structure in Swift that allows you to check if an Optional rhs holds a value, and in case it does - unwraps and assigns it to the lhs. if let someOptionalStringConstant = someOptionalString { // has `Some` value, non-nil if !someOptionalStringConstant.hasPrefix("ok") { |