Swift

1.API Design Guidelines
https://swift.org/documentation/api-design-guidelines/

2.Protocol-Oriented Programming in Swift
<iOS 9 Tutorial Series: Protocol-Oriented Programming with UIKit>
https://www.captechconsulting.com/blogs/ios-9-tutorial-series-protocol-oriented-programming-with-uikit  
<Swift 2.0之初识面向协议编程>
http://www.jianshu.com/p/3bff58e6bd8b 

3.functional programming
<Swift 函数式编程实践>
http://www.swiftmi.com/topic/350.html
<Swift の 函数式编程>
https://io-meter.com/2014/06/04/swift's-functional-programing/
<Swift函数式编程范式下的模板模式实践>
http://www.jianshu.com/p/c4f185e4cd72

4.Protocol List for Swift 2.2
Equatable
http://nshipster.cn/swift-comparison-protocols/
http://www.jianshu.com/p/8d528c08c31b

5.Should I use a Swift struct or a class?
http://faq.sealedabstract.com/structs_or_classes/#swift-value-types

6.swift code skill
<10个惊艳的Swift单行代码>
http://www.cocoachina.com/swift/20160429/16051.html

7.swift blog
http://swift.gg
https://medium.com/swift-programming
https://swiftnews.curated.co/issues?page=1 (this week in swift)