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

Original answer

This can also be implemented as a minus func:

func -( lhs:T, rhs:T ) -> T {

    var lhs = lhs
    for element in rhs {
        if let index = lhs.indexOf(element) { lhs.removeAtIndex(index) }
    }

    return lhs
}

Now you can use

arrayA - arrayB

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Updated implementation for Swift 5

func -(lhs: T, rhs: T) -> T where T.Iterator.Element: Equatable {

    var lhs = lhs
    for element in rhs {
        if let index = lhs.firstIndex(of: element) { lhs.remove(at: index) }
    }

    return lhs
}