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== Exception Handling in Elixir == [[File:Elixir logo.png|thumb|Elixir Programming Language Logo]] Exception handling in Elixir provides a robust mechanism to handle and recover from unexpected errors or abnormal situations in a reliable and controlled manner. Elixir's exception handling approach is based on the concept of 'try-catch' blocks, where potential exceptions are captured and dealt with accordingly. === Basic Syntax === The basic syntax for exception handling in Elixir is as follows: ```elixir try # Code block that may raise exceptions catch pattern -> # Exception handling code pattern -> # Exception handling code finally # Cleanup code to be executed regardless of an exception end ``` - The `try` block contains the code that may raise exceptions. - Multiple `catch` blocks can be defined to match different exception patterns. - The `finally` block is optional and is executed regardless of whether an exception occurs. === Raising Exceptions === Exceptions in Elixir can be raised using the `raise/1` or `raise/2` functions. The former is used to raise a generic exception while the latter allows for a more specific exception with a custom message. ```elixir raise "Something went wrong" raise ArgumentError, message: "Invalid argument" ``` === Catching Exceptions === Exceptions can be caught using the `catch` block in the `try-catch` construct. Multiple catch blocks can be defined to match different exception patterns. ```elixir try # Code that may raise exceptions catch exception_type -> # Exception handling code for matching exception_type exception_type when condition -> # Exception handling code for matching exception_type and condition catch :really_bad -> # Exception handling code for :really_bad exception catch exception, stacktrace -> # Exception handling code for any other exception finally # Cleanup code to be executed regardless of an exception end ``` === Reraising Exceptions === Using the `reraise/1` function, an exception that was caught can be re-raised, allowing it to be handled further up the call stack. ```elixir try # Code that may raise exceptions catch exception_type -> # Exception handling code reraise exception_type end ``` === Safe Navigation === Elixir provides a safe navigation operator `&` that can be used to safely access nested data structures and handle any potential exceptions that may occur. ```elixir result = some_function() case &result.field1.field2 do nil -> "Field not found" value -> value end ``` === Links to Related Topics === - [[Pattern Matching in Elixir]] - [[Error Handling in Elixir]] - [[Concurrency in Elixir]] {{Elixir}} {{Programming Language}} [[Category:Elixir]] [[Category:Exception Handling]] [[Category:Error Handling]] [[Category:Software Development]]
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