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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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Ignore Xcode warnings when using Cocoapods
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answered Nov 3 '12 at 12:11
alloyalloy
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php static function
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edited Dec 20 '14 at 3:01
Makyen♦
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ans...
python location on mac osx
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63
[GCC 4.2.1 (Apple Inc. build 5646)] is the version of GCC that the Python(s) were built with, no...
SQL Server: converting UniqueIdentifier to string in a case statement
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aaronaaarona
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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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3 Answers
3
Active
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Proper usage of Optional.ifPresent()
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edited Feb 15 '19 at 19:36
jwismar
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answered Ju...
Is Enabling Double Escaping Dangerous?
... edited Feb 15 '18 at 22:24
t3chb0t
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answered Sep 21 '09 at 7:43
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How do I clone a github project to run locally?
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ThiloThilo
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How to deep copy a list?
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239
E0_copy is not a deep copy. You don't make a deep copy using list() (Both list(...) and testLis...