filter takes a predicate closure and returns a new array containing only the elements for which the predicate returns true.
A function pointer is a piece of data which stores the location of some code. A program uses this data to decide what code to run next. Programs themselves can modify function pointers in order to alter their functionality as they run, but, if we can modify the function pointer, we can also alter what the program does, including in ways that may be unintended.，更多细节参见新收录的资料
不是否定这个产品，能被这么多人追捧，国内外都在讨论，它一定在技术/功能/产品上任一点做对了什么。但我总忍不住想一个问题：这么火，然后呢？。新收录的资料对此有专业解读
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