Swift-Interval operator (... And.. <)

The interval operator can be used to represent a collection of scopes between two operands

1, closed interval operator: a...b

 for inch ... 1024x768 {            print (icount)// traversal from 512 to 1024 (including 1024x768)        }

2, semi-closed interval operator: A.. <b

ET fruts = ["Apple","Orange","banana"  ]        = fruts.count        for in0.. <icount {            print ( i+1) fruit is \ (fruts[i])        }

3, the string range can also use the interval operator

//string InterceptionLet words ="hhggll.com"                //do not use interval operatorsLet index = Words.startIndex.advancedBy (3) Let Index2= Words.startIndex.advancedBy (6) Let Range1= range<string.index>(Start:index, end:index2) let RangeStr1=words.substringwithrange (range1) print (RANGESTR1)//using interval operatorsLet Range2 = Words.startIndex.advancedBy (3).. <words.startindex.advancedby (6) Let RangeStr2=words.substringwithrange (range2) print (RANGESTR2) let Hwords="hhggll.com"Let interval="a"..."Z"         forCinchHwords.characters {if!Interval.contains (String (c)) {print ("\ (c) is not a lowercase letter")            }                    }

Original link: http://www.hangge.com/blog/cache/detail_513.html

Swift-Interval operator (... And.. <)