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【Swift】配列同士の引き算

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実装

配列を比較して、重複する要素を削除する方法です。
平たく言うと、配列同士の引き算をして差分を求める方法です。

例1
let intArray: [Int] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] //引かれる
let evenArray: [Int] = [0, 2, 4, 6, 8] //引く

let oddArray: [Int] = intArray.filter{ !evenArray.contains($0) }

print(oddArray)
// -> [1, 3, 5, 7, 9]
例2
let words: [String] = ["しりとり", "りんご", "ごりら", "ラッパ", "パンダ"] //引かれる
let animals: [String] = ["ごりら", "パンダ"] //引く

let nonAnimals: [String] = words.filter{ !animals.contains($0) }

print(nonAnimals)
// -> ["しりとり", "りんご", "ラッパ"]

参考

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