positional

components.my-component.js

import Ember from 'ember';

const Component =  Ember.Component.extend({
  layoutName: "components/my-component",
  tagName: "form",
  foo: null
});

Component.reopenClass({
  positionalParams: ["foo"]	
});

export default Component;

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#my-component "foooooo" as |f|}}
	{{f.foo}}
{{/my-component}}
<br>
<br>

templates.components.my-component.hbs

{{yield this}}

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.js",
    "ember": "beta",
    "ember-template-compiler": "beta",
    "ember-testing": "beta"
  },
  "addons": {}
}