New Twiddle

components.mapped-args.js

import Ember from 'ember';

const Component = Ember.Component.extend();

Component.reopenClass({
  positionalParams: ["first", "second", "third", "fourth"]
});

export default Component;

components.rest-args.js

import Ember from 'ember';

const Component = Ember.Component.extend();

Component.reopenClass({
  positionalParams: "restArgs"
});

export default Component;

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{rest-args "foo" "bar" "baz" "bat" case="non-closure"}}

{{mapped-args "foo" "bar" "baz" "bat" case="non-closure"}}

{{component (component (component (component "rest-args" "foo") "bar") "baz") "bat" case="closure (one at a time)"}}

{{component (component (component (component "mapped-args" "foo") "bar") "baz") "bat" case="closure (one at a time)"}}

{{component (component "rest-args" "foo" "bar") "baz" "bat" case="closure (two at a time)"}}

{{component (component "mapped-args" "foo" "bar") "baz" "bat" case="closure (two at a time)"}}

{{component (component (component "rest-args" "foo" "bar") "baz") "bat" case="closure (ZOMG)"}}

{{component (component (component "mapped-args" "foo" "bar") "baz") "bat" case="closure (ZOMG)"}}

templates.components.mapped-args.hbs

<h1>Mapped args {{case}}</h1>

<ol>
  <li>{{first}}</li>
  <li>{{second}}</li>
  <li>{{third}}</li>
  <li>{{fourth}}</li>
</ol>

<hr>

templates.components.rest-args.hbs

<h1>Rest args {{case}}</h1>

<ol>
  {{#each restArgs as |arg|}}
    <li>{{arg}}</li>
  {{/each}}
</ol>

<hr>

twiddle.json

{
  "version": "0.11.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.11.0",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.11.0",
    "ember-testing": "2.11.0"
  },
  "addons": {}
}