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Add an element to an array in Swift

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?

Solution

  • 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.