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How to Get Struct Name In Elixir?

4 minutes read

In Elixir, we can get the name of a struct by accessing its __struct__ field. This field contains a reference to the module that defines the struct, which essentially represents the name of the struct. We can access the __struct__ field by using the Map.get/2 function on an instance of the struct. Here is an example code snippet that demonstrates how to get the name of a struct in Elixir:

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defmodule User do
  defstruct name: "", age: 0
end

user = %User{name: "Alice", age: 30}
struct_name = Map.get(user, __struct__)
IO.puts(struct_name)


In this example, we define a struct User with fields name and age. We create an instance of the User struct and store it in the user variable. We then use the Map.get/2 function to access the __struct__ field of the user struct, which gives us the name of the struct (User in this case). Finally, we output the name of the struct using IO.puts.


How to get the struct name correctly in Elixir functions?

In Elixir, you can get the name of a struct using the __struct__ key in the struct itself. Here is an example of how you can get the struct name in a function:

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defmodule MyStruct do
  defstruct name: "John"
end

def get_struct_name(struct) do
  IO.inspect(struct.__struct__)
end

my_struct = %MyStruct{}
get_struct_name(my_struct) # This will output "MyStruct"


By accessing the __struct__ key in the struct, you can get the name of the struct.


How do I identify the struct name in Elixir?

In Elixir, you can identify the name of a struct by using the __struct__ key in the struct. For example, if you have a struct named User:

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defmodule User do
  defstruct name: ""
end

user = %User{name: "Jane Doe"}

IO.inspect(user.__struct__)


This will output:

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User



What is the syntax for getting the struct name in Elixir?

To get the name of a struct in Elixir, you can use the __struct__ field that is automatically added to every struct. Here is an example:

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defmodule User do
  defstruct name: "John", age: 30
end

user = %User{name: "Alice", age: 25}
struct_name = Map.get(user, "__struct__")
IO.puts(struct_name) # This will output "User"


In this example, we define a struct User with fields name and age. We create a user struct instance and then use Map.get(user, "__struct__") to get the name of the struct, which is "User".


What is the function to retrieve the struct name in Elixir?

In Elixir, you can retrieve the name of a struct using the Macro module and the struct key.


Here is an example of how you can retrieve the name of a struct:

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defmodule ExampleStruct do
  defstruct name: "example"
end

struct = %ExampleStruct{}
struct_name = Map.get(struct, __struct__)
IO.puts(struct_name) # This will output ExampleStruct


In this example, we define a struct called ExampleStruct and create an instance of it. We then use the Map.get function to retrieve the value associated with the key struct which will give us the name of the struct. Finally, we print out the name of the struct using the IO.puts function.


What is the relevance of struct names in Elixir pattern matching?

In Elixir, struct names are relevant in pattern matching because they allow for the more specific matching of data structures. When pattern matching on a struct, you can match on the struct name itself as well as specific fields within the struct. This allows you to define different behavior based on the type of struct being matched, similar to how classes and objects work in object-oriented programming.


Struct names are used in pattern matching to provide clarity and organization to your code. By explicitly matching on struct names, you can ensure that your code is handling different types of data structures appropriately and clearly communicate your intentions to other developers who may be reading your code.


Overall, struct names in Elixir pattern matching provide a way to distinguish between different types of data structures and define behavior based on those distinctions.


What is the significance of struct names in Elixir data structures?

Struct names in Elixir data structures are important for several reasons:

  1. They provide a way to define a custom data type in Elixir. By creating a struct with a specific name, developers can define the structure and behavior of that data type, including which fields it contains and what functions can operate on it.
  2. Struct names help ensure clear and consistent code by providing a descriptive label for each data structure. This can make it easier for developers to understand the purpose and intended use of a particular struct when reading and maintaining the code.
  3. Struct names also help make code more readable and maintainable by providing a clear indication of the type of data being represented. This can make it easier to reason about the code and avoid errors that can arise from misinterpreting the structure of a data type.


Overall, struct names play an important role in defining and organizing data structures in Elixir code, helping to improve clarity, consistency, and maintainability.

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