Optional Extension Reference


                    
                    
                    isNil

判断是否为空

Swift

public var isNil: Bool { get }


                    
                    
                    isNotNil

判断是否有值

Swift

public var isNotNil: Bool { get }


                    
                    
                    or(_:)

返回解包后的值或者默认值

Swift

public func or(_ default: Wrapped) -> Wrapped


                    
                    
                    or(else:)

返回解包后的值或else表达式的值

Swift

public func or(else: @autoclosure () -> Wrapped) -> Wrapped


                    
                    
                    or(else:)

返回解包后的值或执行闭包返回值

Swift

public func or(else: () -> Wrapped) -> Wrapped


                    
                    
                    on(some:)

当可选值不为空时，执行 some 闭包

Swift

public func on(some: () throws -> Void) rethrows


                    
                    
                    on(none:)

当可选值为空时，执行 none 闭包

Swift

public func on(none: () throws -> Void) rethrows

Optional