elixir catch
In Elixir, the catch
keyword is used to catch and handle exceptions. It is typically used in conjunction with the try
keyword to wrap a block of code that may potentially raise an exception.
Here's the syntax for using catch
in Elixir:
try do
# Code that may raise an exception
catch
pattern1 -> # Handle exception 1
pattern2 -> # Handle exception 2
...
end
Within the catch
block, you can specify one or more patterns to match against the exceptions that may be raised. Each pattern is followed by an arrow (->
) and the code to handle the specific exception.
For example, let's say you have a function that divides two numbers and you want to handle the case when the denominator is zero. You can use catch
to catch the ZeroDivisionError
and handle it accordingly:
try do
result = numerator / denominator
catch
ZeroDivisionError -> IO.puts("Error: Division by zero")
end
In this example, if the numerator
is divided by zero (denominator
), the ZeroDivisionError
exception will be caught and the message "Error: Division by zero" will be printed.
It's important to note that using catch
without any patterns will catch all exceptions. However, it's generally considered a good practice to be specific about the exceptions you want to handle, rather than catching all of them.
That's a brief overview of how to use the catch
keyword in Elixir. Let me know if you have any further questions.