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tips积累

tips积累

作者: 彭世鑫 | 来源:发表于2018-05-08 17:16 被阅读0次

#不好的做法varappendArr:[String] = ["c","d","e"]varstrArr:[String] = ["a","b"]forvarx in appendArr{ strArr.append(x)}print("\(strArr)")#好的做法varappendArr:[String] = ["c","d","e"]varstrArr:[String] = ["a","b"]strArr.reserveCapacity(strArr.capacity+appendArr.capacity)strArr.appendContentsOf(appendArr)print("\(strArr)")

作者:氮化镓加砷

链接:https://www.jianshu.com/p/55e485542399

來源:简书

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