Use proc to create a function


hello = proc { "Hello" }
puts hello.call

1.	A Proc is an object that holds a chunk of code.
2.	Proc object picks up the surrounding environment when it is created.
3.	A quicker way to create our hello Proc
4.	Ruby lets you store procedures or procs, as they're called as objects, complete with their context.
5.	coax a method to convert an associated block to a proc on the fly.
6.	Use Proc.new, proc and lamda to create methods
7.	Use Proc.new to create a new method

Use proc to create a function : Procs « Method « Ruby