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nubbel/Swift: Nil coalescing assignment operator

Created November 5, 2014 11:13
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Swift: Nil coalescing assignment operator
infix operator ??= {
associativity right
precedence 90
assignment
}
func ??=<T>(inout optional: T?, defaultValue: @autoclosure () -> T?) -> T? {
optional = optional ?? defaultValue()
return optional
}
var x: Int? = 2
var y: Int? = nil
x ??= 99
x // => 2
y ??= 99
y // 99
@nubbel
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nubbel commented Jan 17, 2017

@Jesbus glad you like it!

@Anton3
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Anton3 commented Feb 8, 2017

@nubbel Should be infix operator ??= : AssignmentPrecedence in Swift 3.

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