22.Array.diff

Description:

Your goal in this kata is to implement a difference function, which subtracts one list from another and returns the result.

It should remove all values from list a, which are present in list b keeping their order.

arrayDiff([1,2],[1]) == [2]

If a value is present in b, all of its occurrences must be removed from the other:

arrayDiff([1,2,2,2,3],[2]) == [1,3]

 

 

function arrayDiff(a, b) {
  return a.filter(x => !b.includes(x));
}

 

우선 , a 배열에 filter()를 사용했는데 

a 배열 내 요소중에 b 배열에서도 그 요소를 포함하지 않는다면 리턴하도록 해주었다.