Different ways to declare a function in Javascript

1)function A(){};             // function declaration
2) var B = function(){};       // function expression
3) var C = (function(){});     // function expression with grouping operators
4) var D = function foo(){};   // named function expression
5) var E = (function(){        // immediately-invoked function expression (IIFE) that returns a function
  return function(){}
})();
6) var F = new Function();     // Function constructor
7) var G = new function(){};   // special case: object constructor