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August 29, 2015 14:12
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Swift nil-check compound assignment operator.
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| infix operator ??= {} | |
| func ??=<T>(inout optional: T?, value: T) { | |
| if optional == nil { | |
| optional = value | |
| } | |
| } | |
| var id: Int? = nil | |
| id ??= 1234 | |
| println(id!) | |
| // 1234 |
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