What is the difference between Procs and Lambdas in Ruby?

What is the difference between Procs and Lambdas in Ruby?

In Ruby, both Procs and Lambdas are types of closures, but they have some key differences. Procs are more flexible with arguments, while Lambdas enforce strict argument checking.

Can you give me an example of each?

Sure! Here's a Proc example:

my_proc = Proc.new { |x| puts x }
my_proc.call(1, 2)  # Outputs: 1

And a Lambda example:

my_lambda = ->(x) { puts x }
my_lambda.call(1, 2)  # Raises an ArgumentError

Why would I choose one over the other?

You might choose a Proc for more flexibility with arguments, while a Lambda is better when you want stricter argument checking and behavior similar to methods.

Are there any performance differences between them?

Generally, Lambdas are slightly slower than Procs due to their stricter argument checking, but the difference is usually negligible for most applications.