How do I convert a Swift Array to a String

Question

I know how to programmatically do it  but I m sure there s a built-in way      Every language I ve used has some sort of default textual representation for a collection of objects that it will spit out when you try to concatenate the Array with a string  or pass it to a print   function  etc   Does Apple s Swift language have a built-in way of easily turning an Array into a String  or do we always have to be explicit when stringifying an array

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Try This   let categories   dictData  value forKeyPath   listing subcategories id   as  NSMutableArray                         let tempArray   NSMutableArray                           for dc in categories                                                       let dictD   dc as  NSMutableDictionary                             tempArray add dictD  object forKey   subcategories name   as  String                                                    let joinedString   tempArray componentsJoined by

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Nowadays  in iOS 13  and macOS 10 15   we might use ListFormatter  let formatter   ListFormatter    let names     quot Moe quot    quot Larry quot    quot Curly quot   if let string   formatter string from  names        print string     That will produce a nice  natural language string representation of the list  A US user will see   Moe  Larry  and Curly  It will support any languages for which  a  your app has been localized  and  b  the user   s device is configured  For example  a German user with an app supporting German localization  would see   Moe  Larry und Curly

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FOR SWIFT 3    func textField textField  UITextField  shouldChangeCharactersInRange range  NSRange  replacementString string  String  - gt  Bool       if textField    phoneField               let newString   NSString string  textField text   replacingCharacters in  range  with  string          let components   newString components separatedBy  NSCharacterSet decimalDigits inverted           let decimalString   NSString string  components joined separator               let length   decimalString length         let hasLeadingOne   length  gt  0  amp  amp  decimalString character at  0      1 as unichar           if length    0     length  gt  10  amp  amp   hasLeadingOne     length  gt  11                       let newLength   NSString string  textField text   length    string as NSString  length - range length as Int              return  newLength  gt  10    false   true                   var index   0 as Int         let formattedString   NSMutableString            if hasLeadingOne                       formattedString append  1                index    1                   if  length - index   gt  3                       let areaCode   decimalString substring with  NSMakeRange index  3               formattedString appendFormat         areaCode              index    3                   if length - index  gt  3                       let prefix   decimalString substring with  NSMakeRange index  3               formattedString appendFormat    -   prefix              index    3                    let remainder   decimalString substring from  index          formattedString append remainder          textField text   formattedString as String         return false           else               return true

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If you question is something like this  tobeFormattedString     a    b    c   Output    abc   String tobeFormattedString

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In Swift 2 2 you may have to cast your array to NSArray to use componentsJoinedByString       let stringWithCommas    yourArray as NSArray  componentsJoinedByString

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Create extension for an Array   extension Array        var string  String             do                let data   try JSONSerialization data withJSONObject  self  options    prettyPrinted                return String data  data  encoding   utf8             catch                return nil

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Since no one has mentioned reduce  here it is   0  1  1  0  map   quot    0  quot   reduce  quot  quot      0    1       quot 0110 quot   In the spirit of functional programming

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A separator can be a bad idea for some languages like Hebrew or Japanese  Try this      Array of Strings let array   String      red    green    blue   let arrayAsString  String   array description let stringAsData   arrayAsString data using  String Encoding utf16  let arrayBack   String    try  JSONDecoder   decode  String  self  from  stringAsData     For other data types respectively      Set of Doubles let set  Set lt Double gt     1  2 0  3  let setAsString  String   set description let setStringAsData   setAsString data using  String Encoding utf16  let setBack  Set lt Double gt    try  JSONDecoder   decode Set lt Double gt  self  from  setStringAsData

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for any Element type  extension Array        func joined glue   - gt Element - gt  Element           var result  Element                result reserveCapacity count   2           let last   count - 1          for  ix item  in enumerated                 result append item               guard ix  lt  last else  continue               result append glue                       return result

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use this when you want to convert list of struct type into string struct MyStruct     var name   String   var content   String    let myStructList    MyStruct name   quot name1 quot    content   quot content1 quot     MyStruct name   quot name2 quot    content   quot content2 quot     and covert your array like this way let myString   myStructList map   0 name   joined separator   quot   quot    will produce     gt    quot name1 name2 quot

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If you want to ditch empty strings in the array     Jet    Fire   filter     0 isEmpty   joined separator   -     If you want to filter nil values as well     Jet   nil       Fire   flatMap    0   filter     0 isEmpty   joined separator   -

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In Swift 4  let array  String      Apple    Pear    Orange    array joined separator

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Swift 3     I Love   Swift   joined separator         previously joinWithSeparator

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Swift 2 0 Xcode 7 0 beta 6 onwards uses joinWithSeparator   instead of join     var array     1    2    3   let stringRepresentation   array joinWithSeparator  -       1-2-3    joinWithSeparator is defined as an extension on SequenceType  extension SequenceType where Generator Element    String           Interpose the  separator  between elements of  self   then concatenate         the result   For example                        foo    bar    baz   joinWithSeparator  - -       foo- -bar- -baz       warn unused result     public func joinWithSeparator separator  String  - gt  String

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if you have string array list   then convert to Int   let arrayList   list map   Int  0          arrayList description   it will give you string value

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You can print any object using the print function  or use   name  to convert any object to a string   Example   let array    1 2 3 4   print array     prints   1 2 3 4    let string      array      string      1 2 3 4   print string     prints   1 2 3 4

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With Swift 5  according to your needs  you may choose one of the following Playground sample codes in order to solve your problem   Turning an array of Characters into a String with no separator  let characterArray   Character      quot J quot    quot o quot    quot h quot    quot n quot   let string   String characterArray   print string     prints  quot John quot    Turning an array of Strings into a String with no separator  let stringArray     quot Bob quot    quot Dan quot    quot Bryan quot   let string   stringArray joined separator   quot  quot    print string     prints   quot BobDanBryan quot    Turning an array of Strings into a String with a separator between words  let stringArray     quot Bob quot    quot Dan quot    quot Bryan quot   let string   stringArray joined separator   quot   quot    print string     prints   quot Bob Dan Bryan quot    Turning an array of Strings into a String with a separator between characters  let stringArray     quot car quot    quot bike quot    quot boat quot   let characterArray   stringArray flatMap    0   let stringArray2   characterArray map   String  0    let string   stringArray2 joined separator   quot    quot    print string     prints   quot c  a  r  b  i  k  e  b  o  a  t quot    Turning an array of Floats into a String with a separator between numbers  let floatArray    12  14 6  35  let stringArray   floatArray map   String  0    let string   stringArray joined separator   quot - quot    print string     prints  quot 12 0-14 6-35 0 quot

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The Swift equivalent to what you re describing is string interpolation  If you re thinking about things like JavaScript doing  x    array  the equivalent in Swift is  x  array     As a general note  there is an important difference between string interpolation vs the Printable protocol  Only certain classes conform to Printable  Every class can be string interpolated somehow  That s helpful when writing generic functions  You don t have to limit yourself to Printable classes

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Mine works on NSMutableArray with componentsJoinedByString  var array     1    2    3   let stringRepresentation   array componentsJoinedByString  -       1-2-3

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If the array contains strings  you can use the String s join method   var array     1    2    3    let stringRepresentation    -  join array      1-2-3    In Swift 2   var array     1    2    3    let stringRepresentation   array joinWithSeparator  -       1-2-3    This can be useful if you want to use a specific separator  hypen  blank  comma  etc    Otherwise you can simply use the description property  which returns a string representation of the array   let stringRepresentation    1  2  3  description      1  2  3     Hint  any object implementing the Printable protocol has a description property  If you adopt that protocol in your own classes structs  you make them print friendly as well  In Swift 3    join becomes joined  example  nil   1    2   flatMap   0   joined   joinWithSeparator becomes joined separator    only available to Array of Strings    In Swift 4  var array     1    2    3   array joined separator  -

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let arrayTemp   String      Mani   Singh   iOS Developer       let stringAfterCombining   arrayTemp componentsJoinedByString         print  Result will be  gt  gt  gt     stringAfterCombining      Result will be      Mani Singh iOS Developer

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To change an array of Optional Non-Optional Strings    Array of optional Strings let array    String       1  nil  2   3   4      Separator String let separator          flatMap skips the nil values and then joined combines the non nil elements with the separator let joinedString   array flatMap   0   joined separator  separator      Use Compact map in case of   Swift 4       let joinedString   array compactMap   0   joined separator  separator  print joinedString    Here flatMap  compactMap skips the nil values in the array and appends the other values to give a joined string

[ios] How do I convert a Swift Array to a String?

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