在水果項的數組創建所選項目的數組

Question

我有一個元素的數組與索引數組從第一陣列刪除：

如果

var array = ["a", "b", "c", "d", "e", "f", "g", "h", "i"]  
let indicesToDelete = [4, 8] 

let reducedArray = indicesToDelete.reverse().map { array.removeAtIndex($0) } 
reducedArray // prints ["i","e"] 

我的數組是這樣的：

class Fruit{ 
let colour: String 
let type: String 
init(colour:String, type: String){ 
    self.colour = colour 
    self.type = type 
    } 
} 

var arrayFruit = [Fruit(colour: "red", type: "Apple"),Fruit(colour: "green", type: "Pear"), Fruit(colour: "yellow", type: "Banana"),Fruit(colour: "orange", type: "Orange")] 
let indicesToDelete = [2,3] 

如果我只是使用上面的代碼，我得到一個錯誤。

let reducedArray = indicesToDelete.reverse().map { arrayFruit.removeAtIndex($0) }////// error here 

我的問題是fruitArray是由對象組成的，我不知道如何調整上面的代碼。

Answer 1

減小的數組不是map的結果，而是原始數組，即arrayFruit。我建議不使用map但forEach，並把它寫這樣的：

class Fruit{ 
    let colour: String 
    let type: String 
    init(colour:String, type: String){ 
     self.colour = colour 
     self.type = type 
    } 
} 

var arrayFruit = [Fruit(colour: "red", type: "Apple"),Fruit(colour: "green", type: "Pear"), Fruit(colour: "yellow", type: "Banana"),Fruit(colour: "orange", type: "Orange")] 
let indicesToDelete = [2,3] 

indicesToDelete.sort(>).forEach { arrayFruit.removeAtIndex($0) } 
arrayFruit // [{colour "red", type "Apple"}, {colour "green", type "Pear"}]