Swift - Testing Arrays for Equality

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Introduction

You can test the equality of two arrays using the == operator.

Two arrays are equal if they contain exactly the same elements and in exactly the same order.

Consider the following example: 

var array1 = [1,2,3,4,5]
var array2 = [1,2,3,4]

These two arrays are not equal, as they do not have the same number of elements: 

print("Equal: \(array1 == array2)")  //false

Now append another element to array2 : 

array2.append (5)

These two arrays are now equal, as they do have the same number of elements in the same exact order: 

print("Equal: \(array1 == array2)")  //true

Suppose you have another array: 

var array3 =  [5,1,2,3,4]

It is not equal to array1 because the order of the elements is not the same: 

print("Equal: \(array1 == array3)")  //false

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