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What's New in Swift 2 —— guard关键词

一、前言本文主要介绍Swift 2新特性，里边的guard关...

What's new in Swift 2.2

From https://www.hackingwithswift.com/swift2-2 ...

What's new in Swift 3

原文：What’s New in Swift 3 作者：COSMIN PUPĂZ...