Learning Swift from scratch (day 14)--Inserting, deleting, and replacing strings

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corresponding variable strings can be inserted, deleted, and replaced, String Several methods are available to help implement these operations. These methods are as follows:

Splice (_:atindex:). Inserts a string at the index position.

Insert (_:atindex:). Inserts a character at the index position.

Removeatindex (_:). Deletes a character at the index location.

RemoveRange (_:). Deletes a string within the specified range.

Replacerange (_:,with:string) . Replaces a string in a specified range with a string or character.

Code:

var str = "Swift" Print ("raw string: \ (str)")  str.splice ("objective-cand " .characters,  Atindex: str.startindex)  print ("after inserting string: \ (str)")  str.insert (".", Atindex: str.endindex)      print ("insert. Word specifier: \ (str)")  str.removeatindex (Str.endIndex.predecessor ()) Print (" Delete. Word specifier: \ (str) ")  var startIndex =str.startIndex             var endindex =advance (startindex, 9)        var range =startindex...endindex       str.removerange ( Range)                   Print ("After delete range: \ (str)")  startindex =str.startindexendindex =advance (startindex, 0) range  =startindex...endindex        str.replacerange (range,with:  "C + +")    print ("After replace range: \(str) ") 

Output Result:

Original string: Swift

after inserting the string: Objective-c and Swift

Insert . word specifier: Objective-cand Swift.

Delete . word specifier: Objective-cand Swift

after the scope is deleted: C and Swift

after the range is replaced: C + + and Swift

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Learning Swift from scratch (day 14)--Inserting, deleting, and replacing strings