Concatenate a collection of String Optionals, ignoring nil values.swift

/// A fun Swift 5 way to concatenate a collection of String? elements, for example a [String?].
extension String.StringInterpolation {
    mutating func appendInterpolation(_ array: [String?]) {
        appendLiteral(array.compactMap { $0 }.joined(separator: ", "))
    }
}

let array: [String?] = [nil, nil, "hello", nil, "world", nil, "abc", nil, nil, nil, nil]
print(array) // prints "[nil, nil, Optional("hello"), nil, Optional("world"), nil, Optional("abc"), nil, nil, nil, nil]"
print("\(array)") // prints "hello, world, abc"

Even cooler stuff here https://www.hackingwithswift.com/articles/178/super-powered-string-interpolation-in-swift-5-0