# &&(_:_:) Performs a logical AND operation on two Boolean values. ``` static func && (lhs: Bool, rhs: @autoclosure () throws -> Bool) rethrows -> Bool ``` ## Parameters `lhs` The left-hand side of the operation. `rhs` The right-hand side of the operation. ## Discussion The logical AND operator (`&&`) combines two Boolean values and returns `true` if both of the values are `true`. If either of the values is `false`, the operator returns `false`. This operator uses short-circuit evaluation: The left-hand side (`lhs`) is evaluated first, and the right-hand side (`rhs`) is evaluated only if `lhs` evaluates to `true`. For example: ``` let measurements = [7.44, 6.51, 4.74, 5.88, 6.27, 6.12, 7.76] let sum = measurements.reduce(0, +) if measurements.count > 0 && sum / Double(measurements.count) < 6.5 { print("Average measurement is less than 6.5") } // Prints "Average measurement is less than 6.5" ``` In this example, `lhs` tests whether `measurements.count` is greater than zero. Evaluation of the `&&` operator is one of the following: - When `measurements.count` is equal to zero, `lhs` evaluates to `false` and `rhs` is not evaluated, preventing a divide-by-zero error in the expression `sum / Double(measurements.count)`. The result of the operation is `false`. - When `measurements.count` is greater than zero, `lhs` evaluates to `true` and `rhs` is evaluated. The result of evaluating `rhs` is the result of the `&&` operation. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)