handling Try catch finally in Ruby

In Ruby, try/catch/finally blocks can be implemented using the begin, rescue, and ensure keywords respectively. Here's how you can use them:

1. Try block: The code that you want to run which may raise an exception is enclosed in a begin block.

2. Catch/Rescue block: If an exception is raised in the "try" block, it is caught by a rescue block that is specified immediately after the begin block.

3. Finally block: The ensure block is always executed after the begin block, regardless of whether an exception was raised or not.

Here's an example:

begin
  # code that may raise an exception
  file = open("non_existent_file.txt")
rescue
  # code to execute if an exception is raised
  puts "Error: file not found"
ensure
  # code to always execute after begin block
  puts "Closing file"
  file.close unless file == nil
end

In the above example, the code tries to open a non-existent file and thus raises a FileNotFoundError. The exception is caught in the rescue block and the appropriate message is printed. Regardless of whether an exception was raised or not, the ensure block is always executed, which, in this case, closes the file if it was successfully opened.