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

Thank you, I'm a noob in Swift and this is really nice to have :-)

@Jesbus glad you like it!

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