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Swift variable decorations with “?” (question mark) and “!” (exclamation mark)
...= 2
// The type here is "Implicitly Unwrapped Optional Int"
var z: Int! = 3
Usage:
// you can add x and z
x + z == 4
// ...but not x and y, because y needs to be unwrapped
x + y // error
// to add x and y you need to do:
x + y!
// but you *should* do this:
if let y_val = y {
x + y_val
}
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php static function
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edited Dec 20 '14 at 3:01
Makyen♦
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SQL Server: converting UniqueIdentifier to string in a case statement
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How to undo the effect of “set -e” which makes bash exit immediately if any command fails?
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Providing a default value for an Optional in Swift?
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What Are the Differences Between PSR-0 and PSR-4?
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Alex_Nabu
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answered Jul 21 '14 at 16:07
SeldaekSeldaek
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Some questions about Automatic Reference Counting in iOS5 SDK
...or iOS 4.2 and is now continuing (and I think will be completed) for iOS 4.3.
I just read about ARC in iOS 5, and basically I understood that we will never need to release and retain objects anymore. My questions are:
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How to pass an ArrayList to a varargs method parameter?
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353
Source article: Passing a list as argument to a vararg method
Use the toArray(T[] arr) meth...