1  # Immutable variable 
 2  
 3  let var1 = 42
 4  
 5  print $"Immutable variable var1 : ($var1)" 
 6  
 7  # Mutable variable 
 8  
 9  mut var2 = 78
10  
11  print $"Original value of var2: ($var2)"
12  
13  $var2 = $var2 * 2
14  
15  print $"New value of var2: ($var2)"