What are lambdas in Ruby and how can I use them in methods?

What are lambdas in Ruby and how can I use them in methods?

Lambdas in Ruby are anonymous functions that can be stored in variables and passed to methods. They are similar to Procs but have stricter argument checking.

Can you show me an example of using a lambda in a method?

Sure! Here's a simple example:

my_lambda = ->(x) { x * 2 }

def apply_lambda(lambda, value)
  lambda.call(value)
end

puts apply_lambda(my_lambda, 5)  # Output: 10

What’s the difference between a lambda and a Proc?

The main difference is that lambdas check the number of arguments, while Procs do not. If you pass the wrong number of arguments to a lambda, it will raise an error.

Can lambdas be used as method arguments?

Yes, you can pass lambdas as arguments to methods, allowing for flexible and reusable code.