14.5 Appending Items to an Array

Items may be added to an array using either the append method or + and += operators. The following, for example, are all valid techniques for appending items to an array:

treeArray.append("Redwood")

treeArray += ["Redwood"]

treeArray += ["Redwood", "Maple", "Birch"]

14.5.1 Inserting and Deleting Array Items

New items may be inserted into an array by specifying the index location of the new item in a call to the array’s insert(at:) method. An insertion preserves all existing elements in the array, essentially moving them to the right to accommodate the newly inserted item:

treeArray.insert("Maple", at: 0)

Similarly, an item at a specific array index position may be removed using the remove(at:) method call:

treeArray.remove(at: 2)

To remove the last item in an array, simply make a call to the array’s removeLast method as follows:

treeArray.removeLast...