Add Array elements with Loop
   --Never use name as a variable in javascript because it is the attribute of the html element if we use name as a variable then in output give us the value is undefined
--The length element is used to count the array size or element dynamically
Associative Array
           --is a key-value pair array where key is as usual named value and value is anything
           --index element is replaced with named value instead of number
Math Objects
             --is used to perform simple math operation in easiest way like pi,e(exponent),sqrt etc.
Date Objects
     --is normally used in javascript to make a interactive clock
setInterval has two parameters in this program first one is method and otherone is miliseconds