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Swift as Kotlin
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| // Returns the value if the predicate evaluates to `true`; otherwise, returns `nil`. | |
| // this function is similar from kotlin takeIf | |
| // | |
| // let number: Int? = 42 | |
| // let result = number.takeIf { $0 > 40 } // Output: Optional(42) | |
| // let invalidResult = number.takeIf { $0 < 40 } // Output: nil | |
| // | |
| // let string: String? = "some text" | |
| // let resultString = string.takeIf { !$0.isEmpty } // Output: Optional("some text") | |
| // let invalidResultString = resultString.takeIf { $0.isEmpty } // Output: nil | |
| import Foundation | |
| public extension Optional { | |
| func takeIf(_ predicate: (Wrapped) -> Bool) -> Wrapped? { | |
| guard let value = self, predicate(value) else { | |
| return nil | |
| } | |
| return value | |
| } | |
| } | |
| public extension NSObject { | |
| func takeIf(_ predicate: (Self) -> Bool) -> Self? { | |
| return predicate(self) ? self : nil | |
| } | |
| } | |
| public extension String { | |
| func takeIf(_ predicate: (Self) -> Bool) -> Self? { | |
| return predicate(self) ? self : nil | |
| } | |
| } | |
| public extension Int { | |
| func takeIf(_ predicate: (Self) -> Bool) -> Self? { | |
| return predicate(self) ? self : nil | |
| } | |
| } | |
| public extension Double { | |
| func takeIf(_ predicate: (Self) -> Bool) -> Self? { | |
| return predicate(self) ? self : nil | |
| } | |
| } | |
| public extension Float { | |
| func takeIf(_ predicate: (Self) -> Bool) -> Self? { | |
| return predicate(self) ? self : nil | |
| } | |
| } |
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