Ruby Crowbar Operator in Swift

SwiftRubyCrowbarOperator.swift

import Cocoa

infix operator  ||= {}

func ||= <T> (inout value: T?, newValue: @autoclosure () -> T) -> T {
    if value == nil {
        value = newValue()
    }
    
    return value!
}

func ||= <T> (inout value: T, newValue: @autoclosure () -> T) -> T {
    return value
}



var myString: String?
myString ||= "Not nil anymore"
myString ||= "ALREADY SET, So no change"
myString

For assignment only, it's not necessary to return anything from these methods.

infix operator ||= {}

func ||=<A> (inout left: A?, right: @autoclosure ()->A) { 
    left = left ?? right() 
}

func ||=<A> (inout left: A, right: @autoclosure ()->A) {  
    // no op
}