Add an element to an array in Swift

Question

Suppose I have an array  for example   var myArray     Steve    Bill    Linus    Bret     And later I want to push append an element to the end of said array  to get     Steve    Bill    Linus    Bret    Tim    What method should I use   And what about the case where I want to add an element to the front of the array  Is there a constant time unshift

User · Answer

Use    and   operators    extension Array       func     lt V gt   inout left   V   right  V        left append right     func    lt V gt  left  Array lt V gt   right  V  - gt  Array lt V gt        var map   Array lt V gt        for  v  in left           map append v             map append right       return map     then use    var list    AnyObject    list     hello   list      hello    world    var list2   list    anything

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To add to the solutions suggesting append  it s useful to know that this is an amortised constant time operation in many cases      Complexity  Amortized O 1  unless self s storage is shared with another live array  O count  if self does not wrap a bridged NSArray  otherwise the efficiency is unspecified    I m looking for a cons like operator for Swift  It should return a new immutable array with the element tacked on the end  in constant time  without changing the original array  I ve not yet found a standard function that does this  I ll try to remember to report back if I find one

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As of Swift 3   4   5  this is done as follows   To add a new element to the end of an Array   anArray append  This String     To append a different Array to the end of your Array   anArray      Moar    Strings   anArray append contentsOf    Moar    Strings      To insert a new element into your Array   anArray insert  This String   at  0    To insert the contents of a different Array into your Array   anArray insert contentsOf    Moar    Strings    at  0    More information can be found in the  Collection Types  chapter of  The Swift Programming Language   starting on page 110

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If you want to append unique object  you can expand Array struct  extension Array where Element  Equatable       mutating func appendUniqueObject object  Generator Element            if contains object     false               append object

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If the array is NSArray you can use the adding function to add any object at the end of the array  like this   Swift 4 2  var myArray  NSArray      let firstElement  String    First element  let secondElement  String    Second element      Process to add the elements to the array myArray adding firstElement  myArray adding secondElement    Result   print myArray        First element    Second element     That is a very simple way  regards

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Example   students     Ben      Ivy      Jordell    1  To add single elements to the end of an array  use the append      students append    Maxime     2  Add multiple elements at the same time by passing another array or a sequence of any kind to the append contentsOf   method  students append contentsOf    Shakia     William     3  To add new elements in the middle of an array by using the insert   at   method for single elements  students insert  Liam    at 2    4  Using insert contentsOf at   to insert multiple elements from another collection or array literal  students insert   Tim   TIM  at  2

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In Swift 4 2  You can use  myArray append  Tim     To add  Tim  into array   or   myArray insert  Tim   at  0    Change 0 with specific location

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You can also pass in a variable and or object if you wanted to   var str1 String    John  var str2 String    Bob   var myArray     Steve    Bill    Linus    Bret      add to the end of the array with append myArray append str1  myArray append str2    To add them to the front     use  insert  instead of append myArray insert str1  atIndex 0  myArray insert str2  atIndex 0     Swift 3 myArray insert str1  at  0  myArray insert str2  at  0    As others have already stated  you can no longer use      as of xCode 6 1

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In Swift 4 1 and Xcode 9 4 1  We can add objects to Array basically in Two ways  let stringOne    One  let strigTwo    Two  let stringThree    Three  var array  String        If your array is string type   Type 1     To append elements at the end array append stringOne  array append stringThree    Type 2     To add elements at specific index array insert strigTwo  at  1    If you want to add two arrays  var array1    1 2 3 4 5  let array2    6 7 8 9   let array3   array1 array2 print array3  array1 append contentsOf  array2  print array1

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You could use    Myarray insert  Data    index    atIndex  index

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Here is a small extension if you wish to insert at the beginning of the array without loosing the item at the first position  extension Array      mutating func appendAtBeginning newItem   Element           let copy   self         self              self append newItem          self appendContentsOf copy

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To add to the end  use the    operator   myArray      Craig   myArray      Jony    Eddy     That operator is generally equivalent to the append contentsOf   method   And in really old Swift versions  could append single elements  not just other collections of the same element type    There s also insert   at   for inserting at any index   If  say  you d like a convenience function for inserting at the beginning  you could add it to the Array class with an extension

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From page 143 of The Swift Programming Language   You can add a new item to the end of an array by calling the array   s append method Alternatively  add a new item to the end of an array with the addition assignment operator       Excerpt From  Apple Inc     The Swift Programming Language     iBooks  https   itun es us jEUH0 l

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Swift 5 3  I believe  The normal array wasvar myArray     quot Steve quot    quot Bill quot    quot Linus quot    quot Bret quot   and you want to add  quot Tim quot  to the array  then you can use myArray insert  quot Tim quot   at  index  so if you want to add it at the back of the array  then you can use myArray append  quot Tim quot   at  3

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