Removing objects from an array based on another array

Question

I have two arrays like this:

var arrayA = [\"Mike\", \"James\", \"Stacey\", \"Steve\"]
var arrayB = [\"Steve\", \"Gemma\", \"James\", \"Lucy\"]

Answer 1

For smaller arrays I use:

/* poormans sub for Arrays */

extension Array where Element: Equatable {

    static func -=(lhs: inout Array, rhs: Array) {

        rhs.forEach {
            if let indexOfhit = lhs.firstIndex(of: $0) {
                lhs.remove(at: indexOfhit)
            }
        }
    }

    static func -(lhs: Array, rhs: Array) -> Array {

        return lhs.filter { return !rhs.contains($0) }
    }
}