# ||(_:_:) Performs a logical OR 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 OR operator (`||`) combines two Boolean values and returns `true` if at least one of the values is `true`. If both values are `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 `false`. For example: ``` let majorErrors: Set = ["No first name", "No last name", ...] let error = "" if error.isEmpty || !majorErrors.contains(error) { print("No major errors detected") } else { print("Major error: \(error)") } // Prints "No major errors detected" ``` In this example, `lhs` tests whether `error` is an empty string. Evaluation of the `||` operator is one of the following: - When `error` is an empty string, `lhs` evaluates to `true` and `rhs` is not evaluated, skipping the call to `majorErrors.contains(_:)`. The result of the operation is `true`. - When `error` is not an empty string, `lhs` evaluates to `false` 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)