Unwrapping an optional or throwing an error
Basics article available: OptionalsHere's a super handy extension on Swift's Optional
type, which gives us a really nice API for easily unwrapping an optional, or throwing an error in case the value turned out to be nil
:
extension Optional {
func orThrow(_ errorExpression: @autoclosure () -> Error) throws -> Wrapped {
switch self {
case .some(let value):
return value
case .none:
throw errorExpression()
}
}
}
let file = try loadFile(at: path).orThrow(MissingFileError())
Support Swift by Sundell by checking out this sponsor:

Bitrise: My favorite continuous integration service. Automatically build, test and distribute your app on every Pull Request — which lets you quickly get feedback on each change that you make. Start 2021 with solid continuous integration from Bitrise, using hundreds of ready-to-use steps.