Swift3.0——字符串與基本運算符中的變化

var string = "Hello-Swift" //獲取某個下標後一個下標對應的字符 char="e" //swift2.2 //var char = string[startIndex.successor()] //swift3.0 var char = string[string.index(after: startIndex)] //獲取某個下標前一個下標對應的字符 char2 = "

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