Where and when to use Lambda?

Question

I am trying to understand why do we really need lambda or proc in ruby (or any other language for that matter)?

#method
def add a,b
  c = a+b
end

#using proc
de         


        

Answer 1

In case of OOP, you should create a function in a class only if there should be such an operation on the class according to your domain modeling.

If you need a quick function which can be written inline such as for comparison etc, use a lambda

Also check these SO posts -

When to use lambda, when to use Proc.new?

C# Lambda expressions: Why should I use them?

When to use a lambda in Ruby on Rails?