如何使用具有不同对象的“重复：计数：”初始化数组？ [复制]

Question

令人惊讶的是，下面的代码打印出SAME，而初始化程序每次都应该调用Z() 构造函数。如何使用此方法对 Z 的不同实例初始化数组？

import Foundation

class Z {
    var i: Int = 0
}

var z: [Z] = [Z](repeating: Z(), count: 10)

if z[0] === z[1] {
    print("SAME")
} else {
    print("NOT SAME")
}

Answer 1

我为此做了一个扩展！

extension Array {    
    /// Create a new Array whose values are generated by the given closure.
    /// - Parameters:
    ///     - count:            The number of elements to generate
    ///     - elementGenerator: The closure that generates the elements.
    ///                         The index into which the element will be
    ///                         inserted is passed into the closure.
    public init(generating elementGenerator: (Int) -> Element, count: Int) {
        self = (0..<count).map(elementGenerator)
    }
}

class Z {
    var i: Int = 0
}

let z = Array(generating: { _ in Z() }, count: 10)

print(z)