swift 5 官方文档 https://docs.swift.org/swift-book/index.html#//apple_ref/doc/uid/TP40014097-CH3-ID0
swift 5译文 : http://www.swift51.com/swift4.0/
swift 5 译文 :https://github.com/SwiftGGTeam/the-swift-programming-language-in-chinese
swift 文档指引:http://swiftguide.cn/
github: https://github.com/
stackoverflow: https://stackoverflow.com
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