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:
# Code that may raise an exception
pattern1 -> # Handle exception 1
pattern2 -> # Handle exception 2
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:
result = numerator / denominator
ZeroDivisionError -> IO.puts("Error: Division by zero")
In this example, if the
numerator is divided by zero (
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.