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Private variables in ES6 Classes.
* So, obviously this is by no means a "new trick",
* but encapsulation in classes works the same as
* it does in "Modules" (IIFE pattern): You hide them
* in a scope, and define the methods that need access
* to them within that same scope. The constructor is
* as good a place as any for that.
import _ from 'underscore';
import { get, set } from '../lib/state';
export default class Model {
let state = _.extend({}, this.defaults, initialState);
this.get = get(state);
this.set = set(state);
export function get(state){
return function(key){
return state[key] || '';
export function set(state){
return function(key, value){
state[key] = value;
return this;

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mlippert commented Aug 23, 2016

I really like this design for private instance variables. I just have one question about the above, how is this.defaults defined?

Perhaps you meant Model.defaults, where the Model.defaults property is defined after the Model class?

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