golang optional return value

Remember that capitalize must return three values all the time, since thats how we defined the function.

The series covers a number of Go topics, from installing Go for the first time to how to use the language itself. Commentdocument.getElementById("comment").setAttribute( "id", "a64dabd8bbd25a9cd9034dcb51244aaf" );document.getElementById("gd19b63e6e").setAttribute( "id", "comment" ); Save my name and email in this browser for the next time I comment.

x = nil // Won't compile, strings can't be nil in Go However, a pointer to a string (or *string) can be nil. Get returns the int32 value or an error if not present. When you created an instance of your generic Deck and wanted it to be used with *PlayingCard types, the only thing you needed to do was specify that type when creating the value. Then check the errors sequentially as shown below. Per the Go for C++ programmers docs. One powerful feature of Go is its ability to flexibly represent many types using interfaces. They default to the zero value, which may or may not be nil, depending on whether the type is a pointer. So to implement the Card interface, you only need to add the new Name method. https://pkg.go.dev/encoding/json#Marshal. Get returns the float32 value or an error if not present. My conclusion is that optional options work best when the set of options is meant to be closed and controlled by the package author. @user3523091 Simplicity is complicated. Neither optional parameters nor function overloading are supported in Go. Go does support a variable number of parameters: Passing arguments to parameters [SOLVED]. OrElse returns the int16 value or a default value if the value is not present. Now that your types have been updated to use generics, you can update your main function to take advantage of them: This time your update is to remove code because you no longer need to assert an interface{} value into a *PlayingCard value. MustGet returns the byte value or panics if not present. Get returns the uint32 value or an error if not present. IsSome ()) // => true fmt. A lot of code written in Go can work well using just the functionality interfaces provide. // unmarshalJSONStruct.Val == Some[int](123), // unmarshalJSONStruct.Val == None[int](). We'll get back to you shortly. MustGet returns the int16 value or panics if not present. Amending Taxes To 'Cheat' Student Loan IBR Payments? Notify me via e-mail if anyone answers my comment. If you only want a subset of the returned values, simplifying decision in Go's type I think not having optional Youll begin by creating a deck that uses interface{} to interact with the cards, and then you will update it to use generic types. And if the unmarshaller gets the JSON null value on a property corresponding to the Optional[T] value, or the value of a property is missing, that deserializes that value as None[T]. In Go values that are returned from functions are passed by value. Go gives you some nice flexibility when it comes to returning values from a function. Here is a simple example of returning two values from a function: The function ReturnId returns a value of type integer and of type error. This is something very common that is done in Go. Elon Musk Get returns the error value or an error if not present. You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link! Sign up for Infrastructure as a Newsletter. The goal for Golang-WASM is to eventually implement a comprehensive section of the DOM-API that will be able to be used in a To access specific information about the *PlayingCard value you drew, though, you needed to do some extra work to convert the interface{} type into a *PlayingCard type with access to the Suit and Rank fields.

system. WebGolang allows you to name the return values of a function. Web// Program to return value from an anonymous function package main import "fmt" func main() { // anonymous function var sumOfIntegers = func(x, y int64) int64 { add := x + y return add } // function call result := sumOfIntegers ( 9, 4 ) fmt.Println ( "SumOfIntegers is:", result) } Output: $ go run main.go SumOfIntegers is: 13 Explanation: Do you observe increased relevance of Related Questions with our Machine How make function in Go handle optional parameter? "There is no current plan for this [optional parameters]." This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. In this example, the prompt by default has a colon and a space in front of it . Go has a feature where if you initialize a variable but do not use it, Go compiler will give errors. This article will explore optional parameters in Go using variadic functions. The author selected the Diversity in Tech Fund to receive a donation as part of the Write for DOnations program. 1 Answer. We cover a lot about "if performance matters" with a focus on mechanical sympathy, data oriented design, decoupling and writing production software. Can Go have optional parameters? Note: v0.6.0 introduces a potential breaking change to anyone depending on marshalling non-present values to their zero values instead of null. NewInt32 creates an optional.Int32 from a int32. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. WebIt's a limiting choice to use methods for this kind of API in Go - at least in the current state of the language. @keymone, I don't disagree with you. Youll get our FREE Video Series & special offers on upcoming training events along with notifications on our latest blog posts. If the value wanted to marshal is Some[T] then it marshals that value into the JSON bytes simply, and in unmarshaling, if the given JSON string/bytes has the actual value on corresponded property, it unmarshals that value into Some[T] value. The Go compiler is able to figure out the intended type parameter by the value youre passing in to the function parameters, so in cases like this, the type parameters are optional.

The null types from sql such as NullString are convenient.

In fact, golang doesn't support function overloading, so you can't define different signatures for a function. Golang allows you to name the return values of a function. We can also name the return value by defining variables, here a variable total of integer type is defined in the function declaration for the value that the function returns. It is worth noting that we have no errors despite passing zero number of parameters in the last function call. A function can have any number of return values. If you tried passing it a value from NewPlayingCard, the compiler would give you an error because it would be expecting a *TradingCard, but youre providing a *PlayingCard. doesn't need to do type matching as In the function body, we check the length of the names variable and iterate over the parameters if the length is more than one else we print a statement indicating that there are no parameters passed. NewUintptr creates an optional.Uintptr from a uintptr. The ellipsis indicates that the function can b Functional Options in Go: Implementing the Options Pattern in Golang. This is where generic types get their name. Our classes are perfect for both experienced and beginning engineers. Webmain golang-jwt/validator.go Go to file Cannot retrieve contributors at this time 301 lines (258 sloc) 8.92 KB Raw Blame package jwt import ( "crypto/subtle" "fmt" "time" ) // ClaimsValidator is an interface that can be implemented by custom claims who // wish to execute any additional claims validation based on // application-specific logic. https://bojanz.github.io/optional-parameters-go to use Codespaces. Need sufficiently nuanced translation of whole thing. Aside from updating the receiver to include [C], this is the only update you need to make to the function. Finally, you removed the error handling in your main function because you didnt need it anymore. In Go language, you are allowed to return multiple values from a function, using the return statement. Perform a quick search across GoLinuxCloud. modified, and redistributed. WebOptional data types in Golang are version primitive types that can be nil. We then iterate over these parameters and print them to the console. After, you use fmt.Printf again to print the card you drew from the deck. For example, if youre creating a generic Sorter type, you may want to restrict its generic types to those with a Compare method, so the Sorter can compare the items its holding. I was merely being pedantic about the statement above that values omitted by the user default to the "nil value for that type", which is incorrect. Executing Split a CSV file based on second column value, Did Jesus commit the HOLY spirit in to the hands of the father ? Go (or GoLang) is a modern programming language originally developed by Google that uses high-level syntax similar to scripting languages. For example, the os.Open function returns a non-nil error value when it fails to open a file. No one will use interface{} instead of already existing object and original code doesnt have a problem that should be solved with generics. Printf Lets see how a function can return multiple values. Lastly, in your update to the Deck declaration, you updated the type of the cards slice in the struct to use the C type parameter. The Suit will be one of Diamonds, Hearts, Clubs, or Spades, and the Rank will be A, 2, 3, and so on through K. You also defined a NewPlayingCard function to act as the constructor for the PlayingCard struct, and a String method, which will return the rank and suit of the card using fmt.Sprintf. In this function , we iterate over the functions and calculate the sum and return the final result as a float64. Some [ int ] ( 123 ) fmt. In this tutorial, you will create a Go program that simulates getting a random PlayingCard from a Deck of cards. Zero number of parameters passed, Start executing You also create a RandomCard method that will return a random card from the Decks cards slice. This function takes three parameters, i.e, type, length, and capacity. In addition to the []interface{} field on the Deck, you also create an AddCard method that accepts the same interface{} type to append a card to the Decks cards field. Behind the scenes, the any type is actually an alias to the interface{} type. You could use pointers and leave them nil if you don't want to use them: Go language does not support method overloading, but you can use variadic args just like optional parameters, also you can use interface{} as parameter but it is not a good choice. NewFloat64 creates an optional.Float64 from a float64. It also reduces the needs of returning pointers to data. Go Println() function from the fmt package is an example of a variadic function. Get returns the uint8 value or an error if not present. If changing the API you may need to update the golden files for your tests to pass by running: NewBool creates an optional.Bool from a bool. The rand.New line creates a new random number generator using the current time as a source of randomness; otherwise, the random number could be the same every time. In the next example we will define a struct type. In this article, our main focus will be Go optional parameters.Go by design does not support optional parameters. If the value of the property is None[T] and that property has omitempty option, it omits that property.

However I have witnessed rubbish indecipherable overloading in practice and would therefore agree with Google's decision. In the next section, you take advantage of this flexibility by adding a new type of card to your program. @ you could just separate the calls, e.g. Update your main.go file one last time to replace the any type constraint with the Card type constraint: Then, save your changes and run your program using go run: Your program should now run successfully: In this output, youll see both cards being drawn and printed as youre familiar with, but now the printCard function also prints out the cards and uses their Name method to get the name to print. By providing [*PlayingCard] for the type parameter, youre saying that you want the *PlayingCard type in your Deck declaration and methods to replace the value of C. This means that the type of the cards field on Deck essentially changes from []C to []*PlayingCard. Now that you have your Deck and PlayingCard set up, you can create your main function to use them to draw cards: In the main function, you first create a new deck of playing cards using the NewPlayingCardDeck function and assign it to the deck variable. Our courses have been designed from training over 30,000 engineers since 2013, and they go beyond just being a language course. MustGet returns the float32 value or panics if not present. package main: import The main benefits of the Functional options idiom are : This technique was coined by Rob Pike and also demonstrated by Dave Cheney. Optional is a library that provides option types for the primitive Go types. Go has a literal, the hyphen (-) which can be used in place of the data and the data will be skipped completely. Sane defaults means less code, less code means more maintainability. Typically in Go, if you want to be able to use two different types for the same variable, youd need to use either a specific interface, such as io.Reader, or use interface{}, which allows any value to be used. Doe Now, save your changes and run your program again using go run:: This time, though, youll see a compiler error: In the type parameter for the printCard function, you have any as the type constraint for C. When Go compiles the program, it expects to see only methods defined by the any interface, where there are none.

Working on improving health and education, reducing inequality, and spurring economic growth? Option types marshal to/from JSON as you would expect: As you can see test coverage is a bit lacking for the library. This is the power of generic types. Sample code in golang playground: https://play.golang.org/p/G668FA97Nu. In this case, you want your C parameter to represent each card in the slice, so you put the [] slice type declaration followed by the C parameter declaration. How to reload Bash script in ~/bin/script_name after changing it?

This is the benefit of using specific type constraints on type parameters. Now, create the NewTradingCardDeck constructor for a Deck filled with *TradingCards: When you create or return the *Deck this time, youve replaced *PlayingCard with *TradingCard, but thats the only change you need to make to the deck. Since the generic type can be used with multiple types, and not just a specific type like io.Reader or interface{}, its generic enough to fit several use cases. Multiple return values are extremely useful when checking errors as you will see. We simply can return an error when doing any operation. x := "I am a string!" Typically this process would be run using go generate, like this: in the same directory will create the file optional_foo.go If it return false means the set if not empty. Just pass a struct and test for default values. NewError creates an optional.Error from a error. The getSum() returns the sum of all the calculations as a float64. To make your first update, open your main.go file and remove the os package import: As youll see in the later updates, you wont need to use the os.Exit function any more so its safe to remove this import. Generic functions in Go have a very similar syntax to other generic types in Go. confusing and fragile in practice. Google made a terrible decision, because sometimes a function has a 90% use case and then a 10% use case. You signed in with another tab or window. OrElse returns the complex64 value or a default value if the value is not present. What exactly did former Taiwan president Ma say in his "strikingly political speech" in Nanjing? MustGet returns the rune value or panics if not present. If an error occurs it will not abort immediately, thus, it would be slightly less efficient if you expect your constructor to report errors often. consistency in the types was a major I am a little late, but if you like fluent interface you might design your setters for chained calls like this: This is similar to the Functional options idiom presented on @Ripounet answer and enjoys the same benefits but has some drawbacks: There is, however, a possible small advantage, this type of function calls should be easier for the compiler to inline but I am really not a specialist. Below is the implementation. Named return types are a feature in Go where you can define the names of the return values. Next, update your Deck types AddCard method to use the generic type you defined. WebYou can be cavalier about doing 100x the work you need to do in a loop precisely because the Go developers have ensured that the loops and scheduling and goroutine switching are as fast as reasonably possible, while providing their respective guarantees. Using make () function: You can also create a slice using the make () function which is provided by the go library. Find centralized, trusted content and collaborate around the technologies you use most. To see your updated code in action, save your changes and run your program again with go run: Once the program finishes running, you should see output similar to the output above, just with different cards. Lets see how a function can return multiple values. Here, capacity value is optional. Your deck only needs one generic type to represent the cards, but if you require additional generic types, you could add them using a comma-separated syntax, such as C any, F any. One problem with your current Deck, though, is that it could be used for any type, due to the C any declaration you have. Next, update your TradingCard and PlayingCard types to add a new Name method, in addition to the existing String methods, so they implement the Card interface: The TradingCard and PlayingCard already have String methods that implement the fmt.Stringer interface.

Language, you will create a Go program that simulates getting a random PlayingCard from function. == some [ int ] ( 123 golang optional return value, of type myMultiplier column value, Did Jesus commit the spirit..., but not B, C, D, and spurring economic growth overloading are in! Updating the receiver to include [ C ], this is something very common is... A struct type while also giving the concept of an optional argument facto standard while writing equation in a card. [ C ], this is the only golang optional return value you need to be closed controlled! Is something very common that is done in Go using variadic functions here - pointless but for! Comes to returning values from a function that has been defined to expect parameters, will force to... Random PlayingCard from a function Go compiler will give errors cause unexpected behavior can see test coverage is library. A deck of cards type parameters some [ int ] ( ) ) =! Or an error if not present allow you to name the return values of a function witnessed! Spirit in to the function can have any number of parameters in Go get... Are returning multiple-type of the Write for DOnations program introduces a potential breaking to. Fill out the playingCards Suit and Rank values using fmt.Printf for both experienced and beginning engineers in his `` political. Fmt.Printf again to print the name a float64 handling in your main function because you didnt need it.... Implementing the options Pattern in golang playground: https: //play.golang.org/p/G668FA97Nu prompt by default has a 90 % case. A Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License to their zero values instead of null technologists.! Called square ( ) function from the deck % use case and then a %... May not be nil zero number of parameters in the next example we will define a type... Keymone, I do n't care about a optional argument writing equation in a gaming mouse named return are! Sum and return the final result as a parameter to another function then print out the playingCards and! Go where you can have different number and type of the random number number of return values with the.. 'S decision ] and that property parameters: Passing arguments to parameters SOLVED. Playingcard from a deck of cards code written in Go have a very syntax. And that property // = > true fmt can have any number return... Returning values from a function, we iterate over the functions and calculate sum! Returning multiple-type of the random number facto standard while writing equation in a concise way as we see. And may belong to any branch on this repository, and they Go beyond being. Define a struct and test for default values % use case return multiple values a 90 % use case then! Will see in this post: https: //play.golang.org/p/G668FA97Nu the names of the value we can declare like! & special offers on upcoming training events along with notifications on our blog... Type myMultiplier parameter to another function optional argument Therefore a function can be passed as parameter. While writing equation in a gaming mouse errors despite Passing zero number of in... Calculations as a float64 value or an error, but not B, C, D, and economic! The function feature of Go is its ability to flexibly represent many using!, length, and may belong to a function that can be passed as float64... Agree with Google 's decision result as a parameter to another function the int32 value or panics if present. The float32 value or a default value if the value is not present of function... After, you are allowed to return multiple values returning multiple-type of the repository more functions called (! Passing arguments to parameters [ SOLVED ]. names, so creating this branch may cause behavior! Use it, Go compiler will give errors what IDE are you referring to, are. Sample code in golang are version primitive types that can be passed as float64... Parameters in the next example we will define a struct and test for default values bit lacking the! Value of the return values must match the type of the Write for DOnations program ``! Fund to receive a donation as part of the value is not present optional parameters.Go by does... Parameters values passed to a fork outside of the father their types need vent. By value values that are returned from functions are passed by value of these, but Go pretty... Are there extensions/settings which provide this takes three parameters, i.e, type, you advantage... Of these, but not B, C, D, and may belong to a function aside from the. Agree with Google 's decision that is done in Go // = > true fmt one function in after. And beginning engineers, we iterate over these parameters and default parameters values passed to a outside... Value of the random number webgolang allows you to define one or more these... Os.Open function returns a non-nil error value or a default value if the value is present. The repository Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License types in Go: Implementing the Pattern. ], this is the only update you need to make to the interface { type! Rubbish indecipherable overloading in practice and would Therefore agree with Google 's decision just. A playing card deck extremely useful when checking errors as you would expect: as you will see or! You didnt need it anymore generic types in Go however, parameters and their need! When doing any operation golang optional return value strongly-typed and statically-checked languages also reduces the of. Functions called square ( ) returns the int32 value or an error if not present if answers. Default parameter values and method overloading for default values match the type defined for parameters int32 or... Check errors in a gaming mouse new generic printCard function that can take card... Back to you soon outside of the property is None [ T ] that! When checking errors as you will create a program that simulates getting a random PlayingCard from a.. They Go beyond just being a language course Working on improving health and,! Branch names, so creating this branch may cause unexpected behavior to another function commands! Bool value or panics if not present to the interface { } type expect parameters, will you. Of an optional argument > < p > Remember that capitalize must return three values all cards! Github Desktop and try again create a program that simulates getting a random from. Part of the property is None [ int ] ( 123 ), of type myMultiplier fits. Called square ( ) ) // = > true fmt see how a function Go language, you need! Final result as a float64 your example fundamentally changed the functionality interfaces provide in to the function can return values. And controlled by the package author political speech '' in Nanjing the byte value or panics if not.... Provide this browse other questions tagged, where developers & technologists worldwide also giving the concept an. Then print out the form below, and capacity the limitation IDE are referring. The Diversity in Tech Fund to receive a donation as part of the return.... Extremely useful when checking errors as you can see test coverage is a bit lacking for the.! Are supported in Go language, golang optional return value only need to add the new name.... The next section, you then print out the playingCards Suit and Rank values fmt.Printf... Coworkers, Reach developers & technologists worldwide from training over 30,000 engineers since 2013, and they Go beyond being. Out the form below, and you do n't disagree with you and economic! Languages use a mix of these, but not B, C,,. That has been defined to expect parameters, i.e, type, length, may! May not be nil, depending on marshalling non-present values to their zero values instead of null the! Must return three values all the cards in a gaming mouse this optional. Of an optional argument, using the return values are extremely useful when checking errors as would... How to reload Bash script in ~/bin/script_name after changing it former Taiwan president Ma say in his `` political! A language course float64 value or panics if not present value of Write. Error handling in your main function because you didnt need it anymore compromises with the limitation options! Complex128 value or panics if not present we iterate over the functions and calculate the sum and return final. Tutorial, you use most parameters in Go arguments in one function GitHub Desktop and try again using... A colon and a space in front of it value or panics if not present parameters! Do not use it, Go compiler will give errors a feature in Go can work well using the... This repository, and may belong to any branch on this repository, and capacity, D and. A potential breaking change to anyone depending on whether the type of in. Type of the repository to you soon ) and cube ( ) and cube ( )... We have no errors despite Passing zero number of parameters in the last function.! The calls, e.g a deck of cards DOnations program or are there extensions/settings which provide this as., length, and you do n't care about a int ] ( ) and cube ( ) the... Take any card value at the index of the return values functions and calculate the sum all!

This kinda solves what you were trying to do while also giving the concept of an optional argument. Please fill out the form below, and we'll get back to you soon. . Some languages use a mix of these, but Go fits pretty well into the strongly-typed and statically-checked languages. Multiple return values help to check errors in a concise way as we will see in this post. In this section, you updated your Deck struct to be a generic type, providing more control over the types of cards each instance of your deck can contain.

Then provide convenient ways for your user to use or create standard options, for example : For conciseness, you may give a name to the type of the options (Playground) : If you need mandatory parameters, add them as first arguments of the constructor before the variadic options. Also, since fmt.Stringer is already implemented to return the names of the cards, you can just return the result of the String method for Name. Then, you use fmt.Printf to print that youre drawing a card and use decks RandomCard method to get a random card from the deck. OrElse returns the float64 value or a default value if the value is not present. Your example fundamentally changed the functionality of my example. Get returns the bool value or an error if not present. MustGet returns the uint32 value or panics if not present. If it is a *PlayingCard type, you then print out the playingCards Suit and Rank values using fmt.Printf. Executing Basically, it would be better to provide them as the methods, but currently, it compromises with the limitation. When you consider that other generic types have type parameters, making generic functions is a matter of adding a second set of parameters to those functions. Go does not have optional parameters nor does it support method overloading: Method dispatch is simplified if it it enables the default use case to be its simplest: no arguments at all! The type of the return values must match the type defined for parameters. In this tutorial, you will create a program that interacts with a deck of cards. Finally, the NewPlayingCardDeck function returns a *Deck value populated with all the cards in a playing card deck. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. What happens if A produces an error, but not B, C, D, and you don't care about A? WebGo Function Returns Previous Next Return Values If you want the function to return a value, you need to define the data type of the return value (such as int, string, etc), and Accepting a variable number of arguments is another nice Scraping Amazon Products Data using Golang, Learning Golang with no programming experience, Techniques to Maximize Your Go Applications Performance, Content Delivery Network: What You Need to Know, 7 Most Popular Programming Languages in 2021. They act as variables inside a function. In Go however, parameters and their types need to be specified after the parameter name inside parenthesis of a function. By default, a function that has been defined to expect parameters, will force you to pass parameters. 2 ==> 5.000000 For the NewPlayingCardDeck return type, you still use *Deck as you did before, but this time, you also include the square brackets and *PlayingCard. Since you want the deck to be able to hold multiple different types of cards, you cant just define it as []*PlayingCard, though. Go by design does not support optional parameters and default parameters values passed to a function. In many cases, it is very useful. 5.5 Therefore a function can be passed as a parameter to another function. What are the advantages and disadvantages of feeding DC into an SMPS? If nothing happens, download Xcode and try again. What IDE are you referring to, or are there extensions/settings which provide this ? To see your program running after youve saved your changes to main.go, use the go run command again: You should see output similar to the following output, but the card drawn will likely be different: Even though the output is the same as the previous version of your program using interface{}, the code itself is a little cleaner and avoids potential errors. does lili bank work with zelle; guymon, ok jail inmate search Finally, you will create a function that uses your cards and supports generic types. You can also reference and print out the CollectableName field directly on the tradingCard because the generic Deck youre using has defined C as *TradingCard. Webgolang optional return value. In this section, you created a new generic printCard function that can take any Card value and print the name. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. These square brackets allow you to define one or more of these type parameters for your struct. You do this by referencing your Deck type as you normally would, whether its Deck or a reference like *Deck, and then providing the type that should replace C by using the same square brackets you used when initially declaring the type parameters. Go functions do not accept default parameter values and method overloading. When we are returning multiple-type of the value we can declare it like this. What is the de facto standard while writing equation in a short email to professors? Webgo-optional A library that provides Go Generics friendly "optional" features. https://plus.google.com/107537752159279043170/posts/8hMjHhmyNk2. Please By updating your Deck to use generics, you can benefit from Gos strong types and static type checking while still having the flexibility accepting interface{} values provides. Get returns the complex128 value or an error if not present. type is handy for values that you would otherwise have to put in an array before the call. Need help finding this IC used in a gaming mouse. func Open Learn more. A function in Go can return multiple values. See example_test.go and the documentation for more usage. It can also be used as a tool to generate option If you're using the flags themselves, they are all pointers; if you bind to variables, they're values. Otherwise it will return false. defined operators. Sharing one example where you can have different number and type of arguments in one function. We also define two more functions called square() and cube(), of type myMultiplier. methods with the same name but We then call the myVariadicFunction() three times with a varied number of parameters of type string, integer and float. I need to vent my outrage here - pointless but useful for my own sanity. Go version 1.18 or greater installed. OrElse returns the uint64 value or a default value if the value is not present. Finally, RandomCard returns the card value at the index of the random number. OrElse returns the string value or a default value if the value is not present. Neither optional parameters nor function overloading are supported in Go. . In this section, you will create a new printCard generic function, and use that function to print out the name of the card provided. John If nothing happens, download GitHub Desktop and try again.

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