How can I use procs for asynchronous callbacks in Ruby?
You can use procs to encapsulate code that you want to execute later, especially in asynchronous operations. For example, you can pass a proc to a method that handles async tasks.
Can you show me a code example?
Sure! Here's a simple example:
async_task = Proc.new { puts 'Task completed!' }
def perform_async_task(callback)
# Simulating an async operation
sleep(2)
callback.call
end
perform_async_task(async_task)
What if I want to pass arguments to the proc?
You can define your proc to accept parameters. For instance:
async_task = Proc.new { |result| puts "Task completed with result: #{result}" }
perform_async_task(async_task, 'Success')
How do I handle errors in this async callback?
You can wrap your callback in a begin-rescue block to handle errors gracefully. Here's an example:
async_task = Proc.new { |result|
raise 'Error occurred!' if result == 'Error'
puts "Task completed with result: #{result}"
}
begin
perform_async_task(async_task, 'Error')
rescue => e
puts e.message
end
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