When should I use a lambda or a proc in Ruby?

What’s the difference between a lambda and a proc in Ruby?

In Ruby, both lambdas and procs are used to create closures, but they have some key differences. Lambdas check the number of arguments passed, while procs do not. Additionally, lambdas return control to the calling method, whereas procs return from the method they were defined in.

When should I use a lambda instead of a proc?

You should use a lambda when you need strict argument checking and want to return control to the calling method. Use a proc when you want more flexibility with arguments and need to return from the enclosing method.

Can you give me an example of each?

Sure! Here's a lambda example:

my_lambda = ->(x) { x * 2 }
puts my_lambda.call(5)  # Outputs 10

And a proc example:

my_proc = Proc.new { |x| x * 2 }
puts my_proc.call(5)  # Outputs 10