iOS swift remove elements of an array from another array

Question

I have two arrays

var array1 = new Array [\"a\", \"b\", \"c\", \"d\", \"e\"]
var array2 = new Array [\"a\", \"c\", \"d\"]

I want to remove

Answer 1

You can create sets and then use the subtract method

let setA = Set(arr1)
let setB = Set(arr2)
setA.subtract(setB)