按范围迭代数组

我有一个数组：[1, 2, 3, 4, 5, 6...100]

我希望将此数组迭代 5 次，具体来说：

取数组的前 5 个数字并获取平均值，继续处理接下来的 5 个数字并获取平均值，依此类推。

我尝试过多种方法，例如Dequeue和 for 循环但未能获得所需的结果。

您需要使用渐进循环来迭代每个 5 个元素，并使用 reduce 对子序列求和，然后将总数除以子序列元素计数：

let sequence = Array(1...100)
var results: [Double] = []

for idx in stride(from: sequence.indices.lowerBound, to: sequence.indices.upperBound, by: 5) {
    let subsequence = sequence[idx..<min(idx.advanced(by: 5), sequence.count)]
    let average = Double(subsequence.reduce(0, +)) / Double(subsequence.count)
    results.append(average)
}
results   // [3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 53, 58, 63, 68, 73, 78, 83, 88, 93, 98]