The Best Design Decision Apple Made in Swift

Apple announced the Swift programming language during this morning’s WWDC. It was lots of fun to read through the five hundred page documentation on iBooks. I am very impressed with how elegantly Apple incorporated functional programming concepts and am very excited about what mainstream adoption of Swift will mean for functional programming.

There is a lot to like about Swift, but my favorite is that only variables explicitly marked as nillable can be assigned a null value. Normal variables cannot be null and accesses to nillable variables have to explicitly unwrap the nil value with a ! or chained with ?.

“nil cannot be used with non-optional constants and variables. If a constant or variable in your code needs to be able to cope with the absence of a value under certain...

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