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how does map and filter implemented?

any ideas?

乖乖小宇宙的围脖

2016-05-22

源自：玩儿转Swift 2.0（第二季） 4-7

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liuyubobobo 回答被采纳 +3 积分
2016-05-30

It's a great question! I really want to introduce more about these kinds of topics, as well as more concepts about Function Programming in the future advanced tutorial video. Just look forwarding to it :)

Hint: We can use extension, which we will introduce in season 4, to extend the ability of a existed class or struct, including Array, of course.