---
title: "||(_:_:)"
framework: swift
role: symbol
role_heading: Operator
path: "swift/bool/__(_:_:)"
---

# ||(_:_:)

Performs a logical OR operation on two Boolean values.

## Declaration

```swift
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

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.

## See Also

### Transforming a Boolean

- [toggle()](swift/bool/toggle().md)
- [!(_:)](swift/bool/!(_:).md)
- [&&(_:_:)](swift/bool/&&(_:_:).md)