Boolean values can be either true or false.
Booleans are used to help evaluate logical expressions.
To declare a boolean value, you can assign a value immediately, or you can use
Bool data type to declare a boolean variable.
var b1:Bool let b2 = false let alphabet = "ABCDEFGHIJKLMNOP" let b4 = alphabet == "ABCDEFGHIJKLMNOP"
The value of
b4 is true because the two strings are the same.