[swift-evolution] [Pitch] Introducing the "Unwrap or Die" operator to the standard library

Adrian Zubarev adrian.zubarev at devandartist.com
Tue Jun 27 12:29:36 CDT 2017

+1 I had a slightly different implementation.


// UnwrapOrTrap.swift
infix operator ?! : NilCoalescingPrecedence

/// Performs a nil-coalescing operation, returning the wrapped value of an
/// `Optional` instance or uses the rhs function to stop the program.
/// - Parameters:
///   - optional: An optional value.
///   - noreturn: A function to stop the programm.
func ?!<T>(optional: T?, noreturn: @autoclosure () -> Never) -> T {
   switch optional {
   case .some(let value):
      return value
   case .none:

Adrian Zubarev
Sent with Airmail

Am 27. Juni 2017 um 19:25:15, Erica Sadun via swift-evolution (swift-evolution at swift.org) schrieb:

Using an operator to provide feedback on the context of a failed unwrap has become a commonly implemented approach in the Swift developer Community. What are your thoughts about adopting this widely-used operator into the standard library?

guard !lastItem.isEmpty else { return }
let lastItem = array.last !! "Array must be non-empty"

Details here:  https://gist.github.com/erica/423e4b1c63b95c4c90338cdff4939a9b

Thank you for your thoughtful feedback, -- E

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