New Twiddle

components.number-count.js

import Ember from 'ember';
import hbs from 'htmlbars-inline-precompile';

const createStore = (reducer) => {
  var pointer = 0;
  var state = [];
  var listeners = [];
  var firstState = reducer();
  state.push(firstState);
  var store = {
    getState() {
      return state[pointer];
    },
    dispatch(action) {
      var nextState = reducer(state[pointer], action);
      state.push(nextState);
      pointer++;
      listeners.forEach((callback) => {
        callback();
      });
    },
    subscribe(callback) {
      listeners.push(callback);
    }
  };
  return store;
}

const reducer = (state, action) => {
  if (action && action.type === 'ADD') {
    var number = state.number;
    var added = number + 1;
    return Object.assign({}, state, {number: added});
  }
  return state || {id: 1, number: 1};
}

const store = createStore(reducer);

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    store.subscribe(() => {
      this.notifyPropertyChange('number');
    });
  },
  number: Ember.computed(function() {
    return store.getState()['number'];
  }),
  actions: {
    add() {
      store.dispatch({type: 'ADD'});
    }
  },
  layout: hbs`
    <h2>Number: {{number}}</h2>
    <button onclick={{action "add"}}>add</button>
  `
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Simple redux in ember</h1>
<br>
{{number-count}}

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-redux": "4.0.0"
  }
}