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The destructuring argument pattern in that closure lets the compiler infer that we want windows of 4 here. If we had used the older .windows(4) iterator, then that argument would be a slice which we would have to index manually, hoping that runtime bounds-checking will be optimized away.。关于这个话题，PDF资料提供了深入分析
Pixel density #macOS has been designed to be legible and usable with a pixel density of about 218PPI (pixels per inch) for “Retina” class desktop displays. If a display’s PPI is higher, text and the macOS user interface will be smaller. If a display’s PPI is lower, text and the macOS user interface will be larger. Stray too far from 218PPI and macOS becomes unusable.