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出于好奇,我在 Swift 中编写了一个类似 GNUfind的模拟器,并且偶然发现了这个时间差异:

$ time find / &>/dev/null
real    1m6.040s

$ time swiftly-find /
real    5m43.028s

斯威夫特代码如下:

let enumeration = FileManager.default.enumerator(at: URL(string: "\(from)/")!, includingPropertiesForKeys: nil, errorHandler: { (at: URL, with: Error) in
    print("Error \(with) encountered at directory \(at)"); return true
})!

var list = String()

for i in enumeration {
    let result = String(describing: i).replacingOccurrences(of: "file://", with: "")
    list.append("\(result)\n")
    print(result)
}

为什么 Swiftenumerator比 GNU 慢得多find?有没有办法加速 Swift 代码以达到类似的速度find

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