Add an element to an array in Swift

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.

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