Carousel

components.collection-carousel.js

import Ember from 'ember';

export default Ember.Component.extend({
  currentCardIndex: 0,
  
  currentCard: Ember.computed('currentCardIndex', 'items.length', function getCurrentCard() {
    const items = this.get('items');
    const currentCardIndex = this.get('currentCardIndex');
 
    console.log('currentCardIndex', currentCardIndex);     
    console.log('items', items);
    
    if (!items || items.length === 0 || currentCardIndex >= items.length) {
      return;
    }
  	return items[currentCardIndex];
  }),
  
  actions: {
  	nextCard() {
    	this.set('currentCardIndex', this._getNextCard());
    },
  	prevCard() {
    	this.set('currentCardIndex', this._getPrevCard());
    },
    removeCard() {
      const items = this.get('items');      
			const currentCardIndex = this.get('currentCardIndex');

      if (items.length > 1 && currentCardIndex === items.length - 1) {
        this.decrementProperty('currentCardIndex');
      }     
      items.removeAt(currentCardIndex);
    }
  },
  
  _getNextCard() {
  	const maxIndex = this.get('items.length');
		const currentCardIndex = this.get('currentCardIndex');
    return (currentCardIndex + 1) % maxIndex;
  },
  _getPrevCard() {
  	const maxIndex = this.get('items.length');
		const currentCardIndex = this.get('currentCardIndex');
    return (currentCardIndex + maxIndex - 1) % maxIndex;
  }  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  init() {
    this.set('cards', [
      {
        title: 'Card 1',
        subtitle: 'Composition in Ember is great',
      },
      {
        title: 'Card 2',
        subtitle: 'It makes components small and reusable',
      }, 
      {
        title: 'Card 3',
        subtitle: 'Not sure...',
      }    
    ]);
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>

{{#collection-carousel
	items=cards
  as |card prevCard nextCard removeCard|
}}
 {{card.title}}
 {{card.subtitle}}
 <br>
 <button {{action prevCard}}>Prev</button>
 <button {{action nextCard}}>Next</button>
 <button {{action removeCard}}>Dismiss</button> 
{{/collection-carousel}}

templates.components.collection-carousel.hbs

{{yield
	currentCard
  (action "prevCard")
  (action "nextCard")
  (action "removeCard")  
 }}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}