Does “let _ = …” (let underscore equal) have any use in Swift?

Question

Does using let _ = ... have any purpose at all?

I\'ve seen question and answers for What's the _ underscore representative of in Swift References? a

Answer 1

You will get a compiler warning if the method has been marked with a warn_unused_result from the developer documentation:

Apply this attribute to a method or function declaration to have the compiler emit a warning when the method or function is called without using its result.

You can use this attribute to provide a warning message about incorrect usage of a nonmutating method that has a mutating counterpart.