Removing object from array in Swift 3

Question

In my application I added one object in array when select cell and unselect and remove object when re-select cell  I used that code but give me error   extension Array       func indexOfObject object   AnyObject  - gt  NSInteger           return  self as NSArray  indexOfObject object             mutating func removeObject object   AnyObject            for var index   self indexOfObject object   index    NSNotFound  index   self indexOfObject object                self removeAtIndex index                     class MyViewController  UITableViewController       var arrContacts   Any           var contacts   Any            func tableView   tableView  UITableView  didDeselectRowAt indexPath  IndexPath            arrContacts removeObject contacts indexPath row             It gives me 2 error like that   C-style for statement has been removed in Swift 3 Value of type   Any   has no member  removeObject

User · Answer

In Swift 3 and 4  var array     a    b    c    d    e    f    for  index  element  in array enumerated   reversed         array remove at  index      From Swift 4 2 you can use more advanced approach faster and memory efficient   array removeAll where     0     c       instead of   array   array filter     0 hasPrefix  c       Read more here

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var a     one    two    three    four    five       Remove filter item with value  three  a   a filter    0     three

User · Answer

For Swift 3  you can use index where   and include a closure that does the comparison of an object in the array   0  with whatever you are looking for   var array     alpha    beta    gamma   if let index   array index where    0     beta        array remove at  index

User · Answer

This is what I ve used  Swift 5         extension Array where Element Equatable                discardableResult         mutating func removeFirst   item Any   - gt  Any                for index in 0   lt self count                   if item as  Element    self index                         return self remove at  index                                              return nil                    discardableResult         mutating func removeLast   item Any   - gt  Any                var index   self count-1             while index  gt   0                   if item as  Element    self index                         return self remove at  index                                    index -  1                           return nil                      var arrContacts  String      quot A quot   quot B quot   quot D quot   quot C quot   quot B quot   quot D quot       var contacts   Any      quot B quot   quot D quot       print arrContacts      var index   1     arrContacts removeFirst contacts index       print arrContacts      index   0     arrContacts removeLast contacts index       print arrContacts   Results       quot A quot    quot B quot    quot D quot    quot C quot    quot B quot    quot D quot        quot A quot    quot B quot    quot C quot    quot B quot    quot D quot        quot A quot    quot B quot    quot C quot    quot D quot    Important  The array from which you remove items must contain Equatable elements  such as objects  strings  number  etc

User · Answer

Another nice and useful solution is to create this kind of extension   extension Array where Element  Equatable         discardableResult mutating func remove object  Element  - gt  Bool           if let index   index of  object                self remove at  index              return true                   return false             discardableResult mutating func remove where predicate   Array Iterator Element  - gt  Bool  - gt  Bool           if let index   self index where     element  - gt  Bool in             return predicate element                           self remove at  index              return true                   return false            In this way  if you have your array with custom objects   let obj1   MyObject id  1  let obj2   MyObject id  2  var array   MyObject     obj1  obj2   array remove where     obj  - gt  Bool in     return obj id    1       OR array remove object  obj2

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The Swift equivalent to NSMutableArray s removeObject is   var array     alpha    beta    gamma    if let index   array firstIndex of   beta         array remove at  index      if the objects are unique  There is no need at all to cast to NSArray and use indexOfObject   The API index of  also works but this causes an unnecessary implicit bridge cast to NSArray   If there are multiple occurrences of the same object use filter  However in cases like data source arrays where an index is associated with a particular object firstIndex of is preferable because it s faster than filter   Update   In Swift 4 2  you can remove one or multiple occurrences of beta with removeAll where     array removeAll  0     beta

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Swift 4  var students     Kofi    Abena    Peter    Kweku    Akosua    if let index   students firstIndex where     0 hasPrefix  A           students remove at  index

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The correct and working one-line solution for deleting a unique object  named  objectToRemove   from an array of these objects  named  array   in Swift 3 is   if let index   array enumerated   filter     0 element     objectToRemove    map    0 offset    first      array remove at  index

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This is official answer to find index of specific object  then you can easily remove any object using that index     var students     Ben    Ivy    Jordell    Maxime   if let i   students firstIndex of   Maxime             students i     Max       students remove at  i    print students     Prints   Ben    Ivy    Jordell     Here is the link  https   developer apple com documentation swift array 2994720-firstindex

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for var index   self indexOfObject object   index    NSNotFound  index   self indexOfObject object  is for loop in C-style and has been removed Change your code to something like this to remove all similar object if it have looped   let indexes   arrContacts enumerated   filter    0 element    contacts indexPath row    map   0 offset   for index in indexes reversed        arrContacts remove at  index

User · Answer

Extension for array to do it easily and allow chaining for Swift 4 2 and up   public extension Array where Element  Equatable        discardableResult     public mutating func remove   item  Element  - gt  Array           if let index   firstIndex where    item     0                  remove at  index                    return self             discardableResult     public mutating func removeAll   item  Element  - gt  Array           removeAll where    item     0            return self

User · Answer

Try this in Swift 3  array remove at  Index    Instead of  array removeAtIndex index    Update   Declaration is only valid at file scope     Make sure the object is in scope  You can give scope  internal   which is default   index of  lt Object gt   to work  class should conform to Equatable

User · Answer

In Swift 5  Use this Extension   extension Array where Element  Equatable      mutating func remove  element  Element            if let i   self firstIndex of  element                self remove at  i                      example   var array     alpha    beta    gamma   array remove element   beta       In Swift 3  Use this Extension   extension Array where Element  Equatable      mutating func remove  element  Element            if let i   self index of  element                self remove at  i                      example   var array     alpha    beta    gamma   array remove element   beta

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