A tool most commonly used together with an if statement is the else statement.

An else statement is used to execute a block of code when the condition of an if statement is false. Think of the else to be synonymous with the word, otherwise. Do this if a condition is true, otherwise, do something else:

if condition {
   this code will run if condition is true
} else {
   this code will run if condition is false 
}

Two rules to remember:

• An else statement must be used in conjunction with an if statement and cannot stand on its own.
• An else statement does not accept a condition and is immediately followed by a code block.

In the previous exercise, we created an if statement that prints a friendly message to logged in users. Let’s use an else statement to complete this logic and print a message to users who are not logged in:

var isLoggedIn = false

if isLoggedIn {
  print("Welcome back!") 
} else {
  print("Access Denied.")  
}
// Prints: Access Denied.

Since the value of isLoggedIn is false, our condition is therefore, false, and the code block following the else will execute.