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Swift has a basic Boolean type Bool. Boolean values are called logical values because they can only be true or false. Swift provides two Boolean constants: true and false.

The type of orangeAreOrange and tumipsAreDelicius is inferred to be Bool, as can be seen from their initial values. Just like the Int and Double types above, if you give them true or false when creating variables and constants, there is no need to declare the type as Bool. Type inference can make Swift code more concise and readable when initializing constants or variables with values of known types.

Boolean values are useful when dealing with conditional statements, such as if statements:

Conditional statements, such as if statements, are described in detail in process control.

Swift's type safety check prevents non-Boolean values from being assigned to Boolean variables. The following example reports a compile-time error:

However, the following example is valid:

The result of this comparison is of type Bool, so the second example passes the type checking. Similar to the iComple1 comparison is described in the basic operator.

As with other types of checks in Swift, this approach avoids accidental errors and ensures that the purpose of a particular part of the code is always clear.

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