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In Ruby, if one were defining constants in classes, they would define them using all caps. For example:
class MyClass MY_FAVORITE_NUMBER = 13 end How do you do this in Elixir? And if no such equivalent exists, how do you get around the problem of magic numbers in Elixir?
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Naming variables follow a snake_case convention in Elixir, i.e., all variables must start with a lowercase letter, followed by 0 or more letters(both upper and lower case), followed at the end by an optional '?' OR '!' .
Module attributes in Elixir serve three purposes: They serve to annotate the module, often with information to be used by the user or the VM . They work as constants. They work as a temporary module storage to be used during compilation.
__MODULE__ is a compilation environment macros which is the current module name as an atom.
Macros are compile-time constructs that are invoked with Elixir's AST as input and a superset of Elixir's AST as output. Let's see a simple example that shows the difference between functions and macros: defmodule Example do defmacro macro_inspect(value) do IO.
You can prepend your variable name with @:
defmodule MyModule do @my_favorite_number 13 end Here are the docs
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