Created
June 22, 2014 23:50
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Abusing optional syntax for better boolean properties
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| class MyClass { | |
| var enabled: Bool? { | |
| didSet { | |
| if let v = enabled? { | |
| self.enabled = v ? true : nil | |
| } | |
| } | |
| } | |
| init(enabled: Bool) { | |
| self.enabled = enabled ? true : nil | |
| } | |
| } | |
| var t1 = MyClass(enabled: true) | |
| if t1.enabled? { | |
| println("t1 is enabled") | |
| } | |
| if t1.enabled { | |
| println("t1 is enabled (without question mark)") | |
| } | |
| var t2 = MyClass(enabled: false) | |
| if !t2.enabled? { | |
| println("t2 is not enabled") | |
| } | |
| if !t2.enabled { | |
| println("t2 is not enabled (without question mark)") | |
| } | |
| var t3 = MyClass(enabled: false) | |
| if t3.enabled? { | |
| println("t3 is enabled") | |
| } else { | |
| println("t3 is not enabled") | |
| } | |
| t3.enabled = true | |
| if t3.enabled? { | |
| println("t3 is enabled") | |
| } else { | |
| println("t3 is not enabled") | |
| } | |
| t3.enabled = false | |
| if t3.enabled? { | |
| println("t3 is enabled") | |
| } else { | |
| println("t3 is not enabled") | |
| } |
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Output: