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What is an Array?
An array is an ordered list with indices / Index.
Examples of an array are a to-do list, shopping list, Amazon Wish List, etc.

Let’s say we have an array list of apps

Index:
0 1 2 3

Element:
“Reminders” “Mail” “Xcode” “Calendar”

Important Note:
The index of the first element always starts with zero because the way computer scientists deal with data in memory, they have offset & offset starts with zero & that’s why the Array begins with zero. The index of an array never exceeds the number of elements.

Here is how to declare an Array in Swift:
We will declare an array with the let or var keyword, the identifier name, the equal sign, and square brackets. A comma separates each element.

var apps = ["Reminders", "Mail", "Xcode", "Calendar"] // Array of Strings, Each element is of Type String
var number = [1, 2, 300, 4000] // Array of Integers, Each element is of Type Integer
var bools = [true, false, false, true] // Array of Boolean values, Each element is of Type Bool
var groups = [["John", "Tom", "Steve"], ["Brandon", "Bill"]] // Array inside array

All About String in Swift Programming Language

Let’s know what String is. String is a collection of characters

Here is how to declare a String

var courseName = "iOS Development"
var language = "Swift"

Here is how to use functions like String Concatenation, i.e. attaching one String to a second string

var hello = "Hello, "
let world = "World! "
let sentence = hello + world + "This is iOS Development" // "Hello, world! This is iOS Development"

Important Note:
As you can see above, we have used the ‘+’ operator to concatenate two strings together