Swift Result Of Is Unused

Many functions in the Swift standard library are marked with warn_unused_result. Result of call to sumab is unused.

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Swift result of is unused. Unfortunately you might get lots of false-positive results because the script just performs text search under the hood. This post is my quick summary of what changed how to suppress the warning if you need to and a feature which may cause you some confusion. Swift 3 Change Before Swift 3 all methods had a discardable result by default.

Removing unused declarations with Periphery. Expression of type UIViewController. Can anyone explain with one example of warn_unqualified_access and warn_unused_result How to solve the problem.

Swift should allow for suppression of warnings especially those that Today Swift does not provide a way to suppress warnings at the source where those warnings are emitted. So it makes sense to verify the scripts output before doing a cleanup. Periphery is an open-source tool written in Swift that aims to find unused declarations in your code.

Assign the return value of the function to _ to explicitly discard it like this. By default in Swift 3 ignoring the return value of a function is now considered a warning. But in Objective-C you could do How to suppress a specific warning in Swift There is possible to disable all interactive warnings globally by disabling Show live issues from Xcode - Preferences.

Map is used first to convert the names in the array to lowercase strings and then to count. Answered Nov 14 16 at 2304. You would add warn_unused_resultmutable_variantmutableMethodHere to tell the compiler of it.

Warn_unused_result Suppose you have an array representing a deck of cards. Result of call is unused 0 Swift 3 Result of call to _parameterscompletionHandler is unused warning and Braced block of statements is an unused closure error. Cd unusedrb As a result of running the script you will get a list of items.

Int- Int return a b sum a. All methods now warn that the return value is not captured. You can install one easily via homebrew.

In order to tell the compiler that the result should be captured you had to add warn_unused_result before the method declaration. _ somethingThatReturnsAValueYouDontCareAbout Swift 3 warns about unused function return values so you need to show it that you know what youre doing. You would get the following warning.

Xcode 8 Swift 3. In Swift if you call a function that returns a result but you dont use it you would get a compiler warning. Move fast and make sure nobody gets pager alerts at 2AM.

Question or problem in the Swift programming language. If you want to tell the compiler that the warning isnt necessary you add discardableResult before the method declaration. No warning would occur when you did not capture what the method returned.

Card standardDeckshuffled You want to write a function to deal a card to a player. Sponsor Hacking with Swift and reach the worlds largest Swift community. This is something folks have been asking for since the very earliest days of Swift so its great to see it finally arrived in Swift 5.

Similar solutions How to fix Function declares an opaque return type but has no return statements in its body from which to infer an underlying type. However with Swift 3 the behavior is flipped. You can follow this list to remove unused code from your project.

Available from iOS 80. Is unused warning 7 Result of call to becomeFirstResponder is unused UITextField inside UITableView. 2 Result of call to sumab is unused.

This has been giving me a lot of warnings of the form Result of call to someFunction is unused. You specify an attribute by writing the symbol followed by the attributes name. Then the function map _ is called on numbers and its result is assigned to result.

SE-0235 introduced a Result type into the standard library giving us a simpler clearer way of handling errors in complex code such as asynchronous APIs. Marking unused required initializers as unavailable 20 May 2020. Browse other questions tagged swift swiftui initializer or ask your own question.

For example the discardableResult attribute on a function declaration indicates that although the function returns a value the compiler shouldnt generate a warning if the return value is unused.

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