elixir rescue
To handle errors and exceptions in Elixir, you can use the rescue
keyword along with the try
block.
The try
block is used to enclose the code that might raise an exception. If an exception is raised within the try
block, the rescue
block is executed. The rescue
block allows you to define a pattern that matches the type of exception you want to handle, followed by the code that should be executed in case of an exception.
Here's an example of how you can use rescue
in Elixir:
try do
# Code that might raise an exception
raise "Oops, something went wrong!"
rescue
exception_type ->
# Code to handle the exception
IO.puts "Caught an exception: #{inspect exception_type}"
end
In the example above, the raise
function is used to intentionally raise an exception. The rescue
block catches the exception and prints a message along with the type of the exception.
You can also use multiple rescue
blocks to handle different types of exceptions:
try do
# Code that might raise an exception
raise "Oops, something went wrong!"
rescue
RuntimeError ->
# Code to handle RuntimeError
IO.puts "Caught a RuntimeError"
ArgumentError ->
# Code to handle ArgumentError
IO.puts "Caught an ArgumentError"
end
In this example, the first rescue
block will handle RuntimeError
exceptions, and the second rescue
block will handle ArgumentError
exceptions.
It's important to note that in Elixir, exceptions are not used for flow control like in some other languages. They should be used for exceptional situations only, and not as a regular part of the program's logic.
That's the basic usage of rescue
in Elixir for handling exceptions. If you have any further questions, feel free to ask!