在ES6，OOP Javascript编程中转换ES5 IIFE

Question

I Need to refactor an IIFE in ES6. In ES6 let and const have a block scope, so I really need an IIFE in ES6? This is the ES5 version of the code:

 var oojs = (function(oojs) { var createToolbarItems = function(itemElements) { var items = []; [].forEach.call(itemElements, function(el, index, array) { var item = { toggleActiveState: function() { this.activated = !this.activated; } }; Object.defineProperties(item, { el: { value: el }, enabled: { get: function() { return !this.el.classList.contains('disabled'); }, set: function(value) { if (value) { this.el.classList.remove('disabled'); } else { this.el.classList.add('disabled'); } } }, activated: { get: function() { return this.el.classList.contains('active'); }, set: function(value) { if (value) { this.el.classList.add('active'); } else { this.el.classList.remove('active'); } } } }); items.push(item); }); return items; }; oojs.createToolbar = function(elementId) { var element = document.getElementById(elementId); var items = element.querySelectorAll('.toolbar-item'); return { items: createToolbarItems(items) } }; return oojs; }(oojs || {})); 

What is the best way to translate this code in ES6? I tried many solution but I miss something, and I get an error: oojs is not defined .

Maybe I can use a Class instead? As you can see from the code I'm writing a Toolbar API in a OOP way (I think...)

Thanks for any help

EDIT: Thanks to georg, I try to refactor my code using classes. This is the new ES6 version:

 class Toolbar { constructor(elementId) { this.elementId = elementId; } get items() { const element = document.getElementById(this.elementId); return element.querySelectorAll(".toolbar-item"); } createToolbarItems() { return [...this.items].map(el => new ToolbarItem(el)); } } class ToolbarItem { constructor(el) { this.el = el; } get enabled() { return !this.el.classList.contains('disabled'); } set enabled(value) { if (value) { this.el.classList.remove('disabled'); } else { this.el.classList.add('disabled'); } } get activated() { return this.el.classList.contains('active'); } set activated(value) { if (value) { this.el.classList.add('active'); } else { this.el.classList.remove('active'); } } toggleActiveState() { this.activated = !this.activated; } } // const toolbar = new Toolbar('myToolbar'); // const toolbarItems = toolbar.createToolbarItems(); 

EDIT: please check if is the right way to write this code, I'm pretty new to ES6

Thanks again

Answer 1

You can start by factoring out the toolbar item code ( var item and below):

class ToolbarItem 
{
    constructor(element) {
      ....
    }
}

Now, decide if you want to keep enabled and activated as properties or refactor them to explicit methods like isEnabled and setEnabled . In the former case it would be,

class ToolbarItem {
   get enabled() {
      ...
   }
   set enabled(value) {
      ...
   }
}

while ordinary methods can be defined like this:

class ToolbarItem {
   isEnabled() {
      ...
   }
   setEnabled(value) {
      ...
   }
}

Once you get this sorted out, replace your item initialization code with items.push(new ToolbarItem(el)) and test.

Hope this helps you getting started, good luck!