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Mastering Elixir: Crafting Custom Error Definitions

Empower your Elixir projects by creating and utilizing custom error definitions. Learn how to define, raise, and personalize your own errors for a more expressive and controlled error-handling experience.

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In the realm of Elixir, crafting custom error definitions adds a layer of control and expressiveness to your projects. Let's delve into the art of defining, raising, and personalizing custom errors for a more refined error-handling experience.

Define Custom Error

defmodule BugError do
  defexception message: "BUG BUG .." # The default message for the BugError
end

Here, we've defined a custom error named BugError using Elixir's defexception macro. The default message for this error is set to "BUG BUG ..", but you can customize it as needed.

Usage

Create a file (e.g., bug_error.ex) and load it into your IEx session:

iex bug_error.ex

Now, let's raise the BugError:

iex> raise BugError
** (BugError) BUG BUG ..

The default message is displayed. However, you can also dynamically pass a custom message:

iex> raise BugError, message: "I am Bug.."
** (BugError) I am Bug..

By mastering custom error definitions, you gain the ability to create error types that align with your application's logic and convey meaningful information. Elevate your error-handling game in Elixir, and let your custom errors tell the story of your code.