Closure return value question

return-question.js

'use strict'
// reference 
// https://www.telerik.com/amp/demystifying-closures-javascript/WEx1ZE1sRUVUWkE5S0dNbEhBNXJyUkU3T1Q4PQ2

const outer = ( () => {
  let privateValue = ''

  function setVar (str) {
    privateValue = str

    return privateValue
  }

  return {
    // Why use one method over another?

    // Method 1
    // Explicity states required parameters, 
    //  don't have to scroll back.  
    set1: (value) => setVar(value),

    // Method 2
    // Looks very clean and nice, why wouldn't
    //  you just name the function set2?
    set2: setVar,

    // Method 3
    setVar
  }

} ) ()

console.log(
  outer.set1('success!'),
  outer.set2('another success!'),
  outer.setVar('a massive success!')
)