Array Custom

Array Custom.md

Array Custom

★ 独自クラスでcontains()やindexOf()を使えるようにする

class EquatableArray: Equatable {                 
    var name: String
    init(_ name: String) { 
        self.name = name
    }
}

func == (l: EquatableArray, r: EquatableArray) -> Bool {    
    return l.name == r.name
}

let apple  = EquatableArray("Apple")
let banana = EquatableArray("Banana")
let orange = EquatableArray("Orange")
var items  = [apple, banana, orange]

let found = items.contains(apple) // true
let index = items.indexOf(banana) // 1
let index = items.indexOf(Item("Orange")) // 2