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?

Answer 1

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.

Answer 2

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