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Functions:

  • A javascript function is a block of code designed to perform a particular task.
  • It is executed when something calls.
  • To define a function we have to use function keyword.
  • Function code is reusable.
  • Function names can contain letters,digits,underscore,and dollar signs

Syntax:
  • Javascript function is defined with the function keyword,followed by name,followed by parentheses()
  • Parenthesis may include parameter names separated by commas.
  • The code to be executed by the function is placed inside a curly braces. 
    Function name(parameter1, parameter2, )
    {
         code to be executed
    }
EX:
Code:
OUTPUT:

Function Parameters:
Function parameters are defined with in the function parenthesis().
These are called as local variables.
Function Return:
Function return will return a value.
Whenever a value is returned a value the function will stop executing.
EX:
Code:
OUTPUT:
Local and Global Variables:
A Variable which is declared inside of the function definition is called as local variable.
The scope of the local variable is with in that function.
A Variable which is declared outside of the function definition is called as Global variable.
The scope of the global variable is through out the program

OUTPUT:
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