Remove last character from string Swift language

Question

How can I remove last character from String variable using Swift  Can t find it in documentation   Here is full example   var expression    45 22  expression   expression substringToIndex countElements expression  - 1

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Swift 4 2  I also delete my last character from String  i e  UILabel text  in IOS app   IBOutlet weak var labelText  UILabel     Do Connection with UILabel   IBAction func whenXButtonPress   sender  UIButton       Do Connection With X Button      labelText text   String  labelText text  dropLast         Delete the last caracter and assign it

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Short answer  valid as of 2015-04-16   removeAtIndex myString endIndex predecessor     Example   var howToBeHappy    Practice compassion  attention and gratitude  And smile    howToBeHappy removeAtIndex howToBeHappy endIndex predecessor    println howToBeHappy      Practice compassion  attention and gratitude  And smile     Meta   The language continues its rapid evolution  making the half-life for many formerly-good S O  answers dangerously brief  It s always best to learn the language and refer to real documentation

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Swift 3  according to the docs  20th Nov 2016  let range   expression index expression endIndex  offsetBy  -numberOfCharactersToRemove    lt expression endIndex expression removeSubrange range

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let str    abc  let substr   str substringToIndex str endIndex predecessor         ab

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The global dropLast   function works on sequences and therefore on Strings    var expression     45 22  expression   dropLast expression       45 2      in Swift 2 0  according to cromanelli s comment below  expression   String expression characters dropLast

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This is a String Extension Form    extension String        func removeCharsFromEnd count  Int  - gt  String           let stringLength   count self           let substringIndex    stringLength  lt  count     0   stringLength - count           return self substringToIndex advance self startIndex  substringIndex             for versions of Swift earlier than 1 2       let stringLength   countElements self          Usage   var str 1    Maxim  println  output    str 1 removeCharsFromEnd 1         Maxi  println  output    str 1 removeCharsFromEnd 3         Ma  println  output    str 1 removeCharsFromEnd 8               Reference      Extensions add new functionality to an existing class  structure  or enumeration type  This includes the ability to extend types for which you do not have access to the original source code  known as retroactive modeling   Extensions are similar to categories in Objective-C   Unlike Objective-C categories  Swift extensions do not have names     See DOCS

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A swift category that s mutating   extension String       mutating func removeCharsFromEnd removeCount Int                let stringLength   count self          let substringIndex   max 0  stringLength - removeCount          self   self substringToIndex advance self startIndex  substringIndex             Use    var myString    abcd  myString removeCharsFromEnd 2  println myString      ab

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Use the function removeAtIndex i  String Index  - gt  Character   var s    abc      s removeAtIndex s endIndex predecessor         ab

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Swift 4  var welcome    Hello World   welcome   String welcome    lt welcome index before welcome endIndex      or  welcome remove at  welcome index before  welcome endIndex     or  welcome   String welcome dropLast

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With the new Substring type usage   Swift 4   var before  String    Hello world   var lastCharIndex  Int   before endIndex var after String   String before    lt lastCharIndex   print after     Hello world   Shorter way   var before  String    Hello world   after   String before    lt before endIndex   print after     Hello world

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The dropLast   function removes the last element of the string   var expression    45 22  expression   expression dropLast

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complimentary to the above code I wanted to remove the beginning of the string and could not find a reference anywhere   Here is how I did it   var mac   peripheral identifier description let range   mac startIndex   lt mac endIndex advancedBy -50  mac removeRange range      trim 17 characters from the beginning let txPower   peripheral advertisements txPower  description   This trims 17 characters from the beginning of the string   he total string length is 67 we advance -50 from the end and there you have it

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Swift 4   let choppedString   String theString dropLast      In Swift 2  do this   let choppedString   String theString characters dropLast      I recommend this link to get an understanding of Swift strings

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import UIKit  var str1    Hello  playground  str1 removeLast   print str1   var str2    Hello  playground  str2 removeLast 3  print str2   var str3    Hello  playground  str3 removeFirst 2  print str3   Output - Hello  playgroun Hello  playgro llo  playground

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Another way If you want to remove one or more than one character from the end    var myStr    Hello World   myStr    myStr as NSString  substringToIndex  myStr as NSString  length-XX    Where XX is the number of characters you want to remove

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I d recommend using NSString for strings that you want to manipulate  Actually come to think of it as a developer I ve never run into a problem with NSString that Swift String would solve    I understand the subtleties  But I ve yet to have an actual need for them    var foo   someSwiftString as NSString   or   var foo    Foo  as NSString   or  var foo  NSString    blah    And then the whole world of simple NSString string operations is open to you   As answer to the question     check bounds before you do this  e g  foo length  gt  0    Note shortFoo is of type NSString var shortFoo   foo substringToIndex foo length-1

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Swift 3  When you want to remove trailing string   func replaceSuffix   suffix  String  replacement  String  - gt  String       if hasSuffix suffix            let sufsize   suffix count  lt  count   -suffix count   0         let toIndex   index endIndex  offsetBy  sufsize          return substring to  toIndex    replacement           else               return self

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The easiest way to trim the last character of the string is   title   title title startIndex    lt  title endIndex advancedBy -1

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Swift 4 0  also Swift 5 0   var str    Hello  World                                Hello  World  str dropLast                                           Hello  Worl   non-modifying  str                                                    Hello  World  String str dropLast                                    Hello  Worl   str remove at  str index before  str endIndex          d  str                                                    Hello  Worl   modifying    Swift 3 0  The APIs have gotten a bit more swifty  and as a result the Foundation extension has changed a bit   var name  String    Dolphin  var truncated   name substring to  name index before  name endIndex   print name           Dolphin  print truncated      Dolphi    Or the in-place version   var name  String    Dolphin  name remove at  name index before  name endIndex   print name           Dolphi    Thanks Zmey  Rob Allen   Swift 2 0  Way  There are a few ways to accomplish this   Via the Foundation extension  despite not being part of the Swift library   var name  String    Dolphin  var truncated   name substringToIndex name endIndex predecessor    print name           Dolphin  print truncated      Dolphi    Using the removeRange   method  which alters the name    var name  String    Dolphin      name removeAtIndex name endIndex predecessor    print name      Dolphi    Using the dropLast   function   var name  String    Dolphin  var truncated   String name characters dropLast    print name           Dolphin  print truncated      Dolphi    Old String Index  Xcode 6 Beta 4    Way  Since String types in Swift aim to provide excellent UTF-8 support  you can no longer access character indexes ranges substrings using Int types  Instead  you use String Index   let name  String    Dolphin  let stringLength   count name     Since swift1 2  countElements  became  count  let substringIndex   stringLength - 1 name substringToIndex advance name startIndex  substringIndex       Dolphi    Alternatively  for a more practical  but less educational example  you can use endIndex   let name  String    Dolphin  name substringToIndex name endIndex predecessor        Dolphi    Note  I found this to be a great starting point for understanding String Index  Old  pre-Beta 4  Way  You can simply use the substringToIndex   function  providing it one less than the length of the String   let name  String    Dolphin  name substringToIndex countElements name  - 1      Dolphi

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var str    Hello  playground   extension String       var stringByDeletingLastCharacter  String           return dropLast self           println str stringByDeletingLastCharacter        Hello  playgroun

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Swift 4 5 var str    quot bla quot  str removeLast      returns  quot a quot   str is now  quot bl quot

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Use the function advance startIndex  endIndex    var str    45 22  str   str substringToIndex advance str startIndex  countElements str  - 1

[string] Remove last character from string. Swift language

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