如何比较两个数组？ 并获得不在另一个元素中的元素？

Question

Let say we have two arrays:

var a = ["Tom", "Harry", "jim", "Allen"]
var b = ["Tom", "Harry", "jim", "Allen", "Chloe", "Jasmine"]

now i want an array which will have the following elements in it:

var requiredArray = ["Chloe","Jasmine"]

Answer 1

Your spec is insufficiently specific, but this is one easy way:

var a = ["Tom", "Harry", "jim", "Allen"]
var b = ["Tom", "Harry", "jim", "Allen", "Chloe", "Jasmine"]
let c = Array(Set(b).subtract(a))

Answer 2

另一种方法是使用filter （请参阅此处 ）：

  let result = b.filter { !a.contains($0) }