Swift: Logical AND Operator

Logical AND Operator in Swift:

Because the logical AND operator in Swift compares two operands and returns a Boolean value. So, it only returns true if both operands are true, and false if at least one operand is false.

&& stands for AND and is represented by two ampersand symbols.

The truth table below shows all of the possible outcomes of an expression with the && operator.

Let’s look at how the && operator works. Assume we’re writing a program for an evening-time application that dims a screen by 35%. For this case, we can use the following if/else statement:

var clock = 7 // PM 
let usePhone = true 
var phoneBrightness: Float
 
if clock >= 7 && usePhone {
  phoneBrightness = 0.65 
} else {
  phoneBrightness = 1 
}
 
print(phoneBrightness) // Prints: 0.65

Notice how only when clock >= 7 and usePhone are both true will the brightness be set to 65%. The brightness would remain the same if the value of clock was less than 7 or if usePhone was set to false.

Helpful Tools:

Here are some useful tools to help you along your journey!

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