Arrays

Arrays can be found in virtually all modern programming languages. In Swift, an array is an ordered list of objects of the same type.

When an array is created, we must declare the type of data that can be stored in it by explicit type declaration or through type inference. Typically, we only explicitly declare the data type of an array when we are creating an empty array. If we initialize an array with data, the compiler uses type inference to infer the data type for the array.

Each object in an array is called an element. Each of these elements is stored in a set order and can be accessed by searching for its location (index) in the array.

Creating and initializing arrays

We can initialize an array with an array literal. An array literal is a set of values that prepopulates the array. The following example shows how to define an immutable array of integers using the let keyword:

let arrayOne = [1,2,3]

If we need to create a mutable array, we would...