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* @param arr 待排序数组，更多细节参见Line官方版本下载
Expected errors should not throw, raise, or panic. Instead, they should return an error result. This works differently in every language, but is often a Result type, a union of null and the success value, or an error code. This pattern pushes you toward handling the error, which you should if you want to make your software reliable.，更多细节参见纸飞机下载
You also get Apple’s Magic Keyboard with Touch Bar (hello, shortcuts), Touch ID for secure login, and up to 10 hours of battery life for working untethered. Four Thunderbolt 3 (USB-C) ports offer flexible connectivity for charging, external displays, and high-speed accessories.