Using () to force a IIFE in ES5 functions vs in ES6 arrow functions

function-exression-ES5-vs-ES6.js

var l = console.log.bind(console);

//          ↓
var jedi1 = ((name, skill) => ({
    name: name,
    skill: skill
}))('Master Yoda', 'The Force') ;
//↑                            ↑ Can't close ) at the end.
l(jedi1.name);
l(jedi1.skill);
// →  Master Yoda
// →  The Force

//          ↓
var jedi2 = (function (name, skill) {
    return {
        name: name,
        skill: skill
    };
}('Luke Skywalker', 'Lightsaber'));
//                               ↑ CAN close ) at the end.
l(jedi2.name);
l(jedi2.skill);
// →  Luke Skywalker
// →  Lightsaber