Swift – Array找值/從集合找尋成員 | firstIndex | contains | filter

Array找值/從集合找尋成員
單純尋找Array裡面是否有值回傳Bool
尋找Array裡面是否有值回傳Index

測試資料Array

var testList = ["測試1","測試2","測試3","測試4","測試5"]

尋找值回傳Bool

if testList.contains("測試2"){
    print("找到了")
}

尋找值並回傳Index

if let index = testList.firstIndex(of: "測試2"){
    print(index)
}