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SWIFT

nil coalescing swift

var a: Int? = nil

// The right operand will be used if the left operand
// evaluates to nil.
print(a ?? "a is nil") // Prints "a is nil"
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Swift Nil-coalescing operator

var someValue:Int!
let defaultValue = 5
let unwrappedValue:Int = someValue ?? defaultValue
print(unwrappedValue)
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