Uncommon Logical stuff of Elixir modules,definitions and some coding snippets that makes our life easy.
###1 :Creating Private Functions ######Code

defp defname (variables) do
    //your definition goes here 
end

######Example

defmodule Mymodule do
@doc This is the public function can be called out side
    def public_function() do 
        IO.puts "I am a public function"
    end 
    defp private_function() do
        IO.puts "I am private function"
    end
end

######Description
Here defp stands for the private function which means you cannot call that function out side module by importing like this Mymodule.private_function.This can be used only inside the another functions in the module it has been defined in our example it can be called inside the public_function

###2 :Pipe Operations `|>' ######Code

getName id |> toUpperCase

######Example

defmodule myModule do
    def function() do
        admin = getNameById id |> toUpperCase |> isAdmin
        IO.puts admin
    end
end

######Description
here the out put of the getNameByID is passed as the first parameter to the toUpperCase in which it returns name as all capitals letters and that name is passed to the isAdmin function to check that the person is admin or not finally a boolean true or false is returned.
The Overall function chain goes like this

getNameById(id).toUpperCase().isAdmin()

###3 :import specific functions ######Code

import :math, only: [sqrt: 1]
import :math, except: [sin: 1, cos: 1]

######Example

import :math, only; [sqrt: 1]
defmodule myModule do
    def function() do
        sqrt 4
    end
end

######Description
In the above example it loads or imports only the sqrt function in to the module.So you no need access the function with the module name :math.sqrt 4 you can directly call them with sqrt 4.How ever you can make use of othe functions like this because you are saying to import only specific functions.
###4 :Default values Functions ######Code

def fall_velocity(distance, gracity \\ 9.8) do
    //code
end

######Example

import :math, only: [sqrt: 1]
defmodule myModule do
    def fall_velocity(distance, gravity \\ 9.8) do
        velocity=sqrt 2*gravity*distance
        IO.puts "the falling velocity is #{velocity}"
    end
end

######Description
In the above code the fall_velocity function takes two params one is distance and another is gravity if you pass only one param then the gravity value is default is set to the 9.8 here you need to give blank space between gravity and \\ and 9.8

###5 :Documentation and specifications ######Code

defmodule myModule do
@moduledoc """
Explanation about the module
""
@vsn 0.1 -- moduel version
@doc """
your documentation here can have multiple 
lines of text 
line 1
line 2 
etc
"""
@spec functionName(number()) :: number()
    def functionName() do
        //code
    end
end

######How to use?

h(moduleName.functionName)
s(modulename.functionName)

######Description
Here h() stands for help when you type like that you will be displayed with the @doc text and similarly when you type s() you will be getting the function specifications it explains what parameters has to pass and what it returns when you call or simply what has to give to the function and what it will give in return.

###6 :Using Erlang From Elixir ######Code

:application.which_applications
:erlang.module_info

######Description
here the list_applications returns the list of applications being executed in an Erlang VM .This is the way to use the function from Elixir.
The erlang would be like this

application:which_applications()     -- moduleName:functionName() 

###7 :Observer GUI ######Code

:observer.start