Use an IIFE to Create a ModulePassed

Why do need to add IIFE if we can do the same without it, that is assign the object consisting of mixings to a variable, and then refer to it? What is the use of adding IIFE?

  **Your code so far**

let funModule = 
(function() {
return {
isCuteMixin: function(obj) {
obj.isCute = function() {
  return true;
singMixin: function(obj) {
obj.sing = function() {
  console.log("Singing to an awesome tune");

}) ()

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Challenge: Use an IIFE to Create a Module

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