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§ Garbage Collector in 20 Lines
。业内人士推荐snipaste截图作为进阶阅读
The fourth requirement (“Dynamic”) ensures that we only create dependencies when they are actually needed. This is easiest to see with conditional formulas, so something like IF(, slow_calculation(B1)). If the condition is true, this formula returns the value of (and therefore depends on) the cell B1. But if the condition is false, the formula returns nothing — and if B1 changes, this cell should not be updated. This is a dynamic dependency — the dependency only exists if is true.
更不用说 iPhone 上的通话录音、夜览、密码 app、Sidecar 等等……一个又一个曾经属于第三方应用的核心功能，陆陆续续被苹果吸纳进了系统，变成了免费功能。